I just want to put 3 thoughts forward

What if we used after tax and plus welfare for the wage over the time period mentioned. A very different answer I am sure.

Second is it seems as we regulate more benefits to the lower end of the labour market, it only increases the top end more.

Why is it that the primary sector has to bear the brunt of the world market for is income, quite different for the domestic market situation where regulations allow for incomes to rise with inflation. (This includes tax in the sale price)