Kevin Durant had a 32.9 usage percentage in 2013-14.

kd usage rate 2014
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NAMESEASONTMGPUSG%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Kevin DurantKevin Durant2013-14OKCOKC8132.938.532.07.45.51.30.73.510.520.850.32.46.139.18.79.987.33,1222,59359844510359285174+509
StatMuse has season-level data for usage percentage going back to the 1977-78 season.