Let's see.
((Years in retirement x average budget) + college withdrawals + real estate)) divided by (original portfolio value when I quit working) = about 2/3.
Current portfolio = original portfolio x 1.25
So, (1/3 OP) / (1.25 OP) = 26%, which would be my original contribution value. Therefore, Ms Market + Mr Inflation have contributed about 74% of my current portfolio. More or less ..
edit to add - if I include my own "portfolio alpha value add" in the post-work era - IOW, my messing with the portfolio asset allocation, I think Ms Market and Mr Inflation have added 100% and I've wasted 24% with bad investment choices. The biggest portfolio contributions I've made is sharply reducing my meddling.