Biologist in Nebraska told me a few years ago they aim to harvest 80% of the available bucks each year. So after season ends, 20% are left at 1.5, 4% (20% of last years' 20%) at 2.5, 0.8% (20% of 4%) at 3.5, etc. Maybe my math is off, but no wonder 4.5 is a trophy. Only 1 of 125 make it there!