I don’t know. When I first looked at it, I was thinking it was just 10 years versus 1 year. Looking closely at it, that clearly can’t be what it is.
I’m going to have to read more about it. Wish I had a better answer than that, but that’s where I’m at right now.
My interpretation would be the following:
Mandatory: The budget that must be expended. (Like paying the mortage.)
Discretionary: Slush fund for pet projects and such. (Like walking around money for a night out on the town.)
That’s why the figures in the last coulumn are so much larger.
But there’s no need to delve into this any further - I was just making an offhand comment.