have you calculated how much you improve on the basic compound exercises each year? could you give an estimate?
I can try. It's hard for me to answer because I caught pneumonia and missed a considerable amount of training during the winter of 2010-2011, and I lost a great deal of strength. Before then, I had 1RMs of a 419 squat, 523 deadlift, and 300 bench press, all at a bodyweight that fluctuated between 160 and 180 lbs.
When I returned to training, my lifts had dropped dramatically. In January, my deadlift was around a 450, my squat was around 320 (I remember being crushed by 365 early in that year), and my bench press had held steady at 270-280. However, they also returned to form extremely quickly too.
The best way for me to answer this question is to compare my current totals to where I was at my April meet last year. At that time, I hit a 386 squat, 276 bench press, and 540 deadlift for a 1202 total. So, my lifts have all improved over the last year; my bench press is being rebuilt right now, but it was as high as 315 for a touch-and-go single, and my deadlift will hopefully reach a new PR of 560+ on Friday. At this point, putting 20 lbs. on my deadlift in a year's time while keeping my weight down is a pretty good year. The big gainer has been my squat, which is up 59 lbs. in the last eleven months.
Now, as far as how my lifts have improved historically, I'm not really sure. I will say that my deadlift shot up very quickly but stalled at around 475 lbs. It took me some time to reach 500, and progress since then has been slow but steady at a pace of about 15-20 lbs. per year.