The Houston Rockets had a usage of 20.0 percent without Dwight Howard in 2015-16.

2016 houston rockets usage without dwight howard
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TEAMSEASONGPUSG%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
Houston RocketsHouston Rockets2015-161120.0240.0103.441.121.99.45.514.037.383.544.612.534.636.216.322.671.92,6401,13745224110360154236-45
StatMuse has game-level data for usage percentage going back to the 1984-85 season.