95%

I donated my 95th unit of whole blood today; I gave my first pint in 1982.  They like my blood because it's O+, which is secondary only to O-, which can be transfused into anyone.

In eight weeks I can donate my 96th unit, which will be my 12th gallon of blood.  Imagine 12 large chlorax containers filled with bright red fluid. 

The date is circled on my calendar, as I'm trying to get to one hundred, a little goal I set for myself.  I'm on track this year to donate six times, like I did last year and one other year. 

The absolute maximum amount you can donate in a year is seven times, but only if you donate right after the new year and right before the end of the year.  You literally have to carefully plan it out, and I've only done it once before.