There have been enough actual and thwarted attacks in Australia and the world in recent years to give credence to butcher's statement, and you can start with 9/11.

While it's politically incorrect to attribute Haider's and Monis' efforts to Islamic extremism in the figures, why must ISIS or some other Islamic outfit have to claim responsibility for what it clearly spawned?

It's a fool's paradise to ignore the high proportion of real terrorism, with its clear intent to kill rather than to damage property, in the name of Islam.

//I looked at your website, and of these 18 events, 4 have been terror attacks by Muslims and 4 non muslim terror attacks the other 10 are undefined.//

You didn't look closely enough then. Count with me:

15/12/2014
Mon Haron Monis attacks the Lindt cafe in Sydney. A well known case. 
Score: Muslims 1; non-Muslims 0, unknown 0.

3/11/2014
Assailants opened fire on Rasoul Al-Musawi outside of an Islamic prayer center in Bankstown area, New South Wales state, Australia. Musawi, a Shiite religious leader, was wounded in the attack. No group claimed responsibility for the incident; however, people chanting pro-Islamic State of Iraq and the Levant (ISIL) statements drove by the center just before the shooting.
Score: Muslims 2; non-Muslims 0, unknown 0.

23/9/2014
Abdul Numan Haider stabs two police officers before being shot and killed. Another well known case.
Score: Muslims 3; non-Muslims 0, unknown 0.

12/8/2014
Assailants set a private vehicle on fire that belonged to an Australian Federal Police (AFP) officer outside the police station in Beechworth town, Victoria state, Australia. Perpetrator unknown.
Score: Muslims 3; non-Muslims 0, unknown 1.

18/5/2014
Informal Anarchist Federation set fire to a luxury vehicle on Moncur street in Woollahra neighborhood, Sydney.
Score: Muslims 3; non-Muslims 1, unknown 1.

18/5/2014
Informal Anarchist Federation set fire to two vehicles on Queen street in Woollahra neighborhood, Sydney.
Score: Muslims 3; non-Muslims 2, unknown 1.

24/2/2014
Assailants threw three homemade incendiary devices at the Logan Police District Headquarters in Logan City, southeast Queensland. Attack attributed to anarchists.
Score: Muslims 3; non-Muslims 3, unknown 1.

2/9/104
Assailants set fire to Gran Turismo Autos, a luxury car showroom in the West Melbourne area. The Informal Anarchist Federation claimed responsibility for the attack.
Score: Muslims 3; non-Muslims 4, unknown 1.

4/2/2014
Assailants fired on a mosque in Queens Park, Perth. Authorities believed that neo-Nazi group Combat 18 were responsible.
Score: Muslims 3; non-Muslims 5, unknown 1.

8/10/2009
An improvised explosive device destroyed a vehicle and damaged two buildings in Condell Park, Sydney. Perpetrator unknown.
Score: Muslims 3; non-Muslims 5, unknown 2.

10/12/2008
Two private vehicles belonging to Warwick....

....police officers were firebombed in Joondalup, Western Australia, by Ryan Jones (not a Muslim).
Score: Muslims 3; non-Muslims 6, unknown 2.

8/12/2008
A Holden Rodeo ute vehicle carrying a 220-liter fuel tank was backed into the Joondalup police station and set aflame by Ryan Jones.
Score: Muslims 3; non-Muslims 7, unknown 2.

21/4/2008
A 30 mm pipe bomb rigged with external batteries and a mobile phone was detonated by the police bomb squad unit after it was found by council workers in Vale View near Toowoomba, Qld. An unidentified 21-year old male was arrested over the incident.
Score: Muslims 3; non-Muslims 7, unknown 3.

1/8/2006
A group of Middle Eastern men stoned Parramatta Synagogue’s roof and windows and damaged cars nearby. It's probably safe to say these guys were Muslims.
Score: Muslims 4; non-Muslims 7, unknown 3.

8/4/2006
The mobile phone shop of former Shapelle Corby backer Ron Bakir was firebombed at 6:00 a.m. when a man bashed the glass doors of the shop with a rock before dropping a cigarette into a canister of fuel on the footpath outside in Broadbeach, Qld. Perpetrator unknown.
Score: Muslims 4; non-Muslims 7, unknown 4.

15/10/2001
A letter delivered by mail to the U.S. Consulate in Melbourne, Australia contained an unknown chemical agent. Perpetrator unknown.
Score: Muslims 4; non-Muslims 7, unknown 5.

23/9/2001
An arsonist destroy a Brisbane mosque. It's probably safe to say this guy was anti-Muslim.
Score: Muslims 4; non-Muslims 8, unknown 5.

17/10/2000
A sniper shot at a train traveling between the between the Normanhurst and Thornleigh suburbs of Sydney. Perpetrator unknown.
Score: Muslims 4; non-Muslims 8, unknown 6.

Well, the plucky Muslims started out well with a few strong goals, but got taken by surprise by the non-Muslims scoring strongly off the backs of anarchists with some notable assists from neo-Nazis and random nutters, ending up a full four points behind and looking like the most ragtag bunch of jihadists you ever saw. A terrible result for the Muslims and a surprise win for the anarchists who will no doubt be torching a few cars tonight in celebration.

TL,

If you want to play with numbers:

Were the two attacks by Ryan Jones the firebug with a serious case of paranoid schizophrenia really acts of terrorism? I am sure that if you widen the definition of terrorist attack far enough you will get thousands. Similarly your assumption that the arson attack on a Mosque was a non muslim is courageous considering the other attacks on mosques by Muslims. And once again you have failed to take in the thwarted attempts at serious carnage by muslim extremists, or the deliberate destruction of property and assaults at the "protest". Finally considering the muslim population is >1%, that puts an entirely different complexion on the issue.