James Harden has a usage of 30.9 percent without Dwight Howard in his career.

harden usage rate without howard
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NAMEGPUSG%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
James HardenJames Harden74430.933.824.65.66.71.50.63.77.216.344.22.87.736.17.38.585.725,16118,2704,1984,9791,1334112,7411,936+2889
StatMuse has game-level data for usage percentage going back to the 1984-85 season.