Kemba Walker had a 26.5 usage percentage in 2015-16.

usage without kemba walker on the floor 2016
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NAMESEASONTMGPUSG%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Kemba WalkerKemba Walker2015-16CHACHA8126.535.620.94.45.21.60.52.17.016.442.72.26.037.14.65.484.72,8851,68935742112639171111+239
StatMuse has season-level data for usage percentage going back to the 1977-78 season.