DeMar DeRozan had the highest usage percentage for the Raptors in 2015-16, at 29.7 percent.

who has the highest usage rate on toronto 2016
Interpreted as:
Who has the highest usage rate with a minimum of 1000 minutes played per 82 team games on toronto 2016?
2015-16DeRozan2015-16Lowry2015-16Valanciunas2015-16Scola2015-16Ross2015-16Joseph2015-16Patterson2015-16Biyombo29.726.120.819.618.317.013.011.4
NAMESEASONTMGPUSG%MPGPPGRPGAPGSPGBPGTPGFGMFGAFG%3PM3PA3P%FTMFTAFT%MINPTSREBASTSTLBLKTOVPF+/-
DeMar DeRozanDeMar DeRozan2015-16TORTOR7829.735.923.54.54.01.00.32.27.917.744.60.61.833.87.18.485.02,8041,8303493158121175167+175
Kyle LowryKyle Lowry2015-16TORTOR7726.137.021.24.76.42.10.42.96.615.642.72.87.138.85.26.481.12,8511,63436549415834225211+380
Jonas ValanciunasJonas Valanciunas2015-16TORTOR6020.826.012.89.10.70.41.31.45.18.956.50.00.02.73.676.11,55776854742258085158+146
Luis ScolaLuis Scola2015-16TORTOR7619.621.58.74.70.90.60.40.93.57.945.00.92.140.40.81.172.61,63666436066462768178-26
Terrence RossTerrence Ross2015-16TORTOR7318.323.99.92.50.80.70.30.63.78.643.11.84.638.60.70.879.01,74772018556542546120+245
Cory JosephCory Joseph2015-16TORTOR8017.025.68.52.63.10.80.31.33.27.343.90.41.427.31.72.276.42,0466772102506320102131+274
Patrick PattersonPatrick Patterson2015-16TORTOR7913.025.66.94.31.20.70.40.82.66.241.41.33.736.20.40.485.32,02054334294533265128+403
Bismack BiyomboBismack Biyombo2015-16TORTOR8211.422.05.58.00.40.21.60.91.93.554.20.00.00.01.72.862.81,808454655291913371225+85
StatMuse has season-level data for usage percentage going back to the 1977-78 season.

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