Dirk Nowitzki had his highest usage percentage in a season in 2008-09, at 30.2 percent.

NAME	USG%	SEASON	TM	GP	MPG	PPG	RPG	APG	SPG	BPG	TPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	MIN	PTS	REB	AST	STL	BLK	TOV	PF	+/-
Dirk Nowitzki	30.2	2008-09	DAL	81	37.7	25.9	8.4	2.4	0.8	0.8	1.9	9.6	20.0	47.9	0.8	2.1	35.9	6.0	6.7	89.0	3,050	2,094	681	197	61	63	157	176	+246
Dirk Nowitzki	30.0	2005-06	DAL	81	38.1	26.6	9.0	2.8	0.7	1.0	1.9	9.3	19.3	48.0	1.4	3.3	40.6	6.7	7.4	90.1	3,089	2,151	728	226	58	83	156	164	+509
Dirk Nowitzki	29.1	2011-12	DAL	62	33.5	21.6	6.7	2.2	0.7	0.5	1.9	7.6	16.7	45.7	1.3	3.4	36.8	5.1	5.7	89.6	2,079	1,342	418	136	42	30	117	129	+261
Dirk Nowitzki	28.8	2006-07	DAL	78	36.2	24.6	8.9	3.4	0.7	0.8	2.1	8.6	17.2	50.2	0.9	2.2	41.6	6.4	7.1	90.4	2,820	1,916	693	263	52	62	167	171	+623
Dirk Nowitzki	28.8	2007-08	DAL	77	36.0	23.6	8.6	3.5	0.7	0.9	2.1	8.2	17.1	47.9	1.0	2.9	35.9	6.2	7.1	87.9	2,769	1,817	659	266	51	71	160	198	+482
Dirk Nowitzki	28.7	2009-10	DAL	81	37.5	25.0	7.7	2.7	0.9	1.0	1.8	8.9	18.5	48.1	0.6	1.5	42.1	6.6	7.2	91.5	3,039	2,027	620	218	70	79	149	208	+349
Dirk Nowitzki	28.5	2004-05	DAL	78	38.7	26.1	9.7	3.1	1.2	1.5	2.3	8.5	18.5	45.9	1.2	2.9	39.9	7.9	9.1	86.9	3,020	2,032	757	240	97	119	176	219	+586
Dirk Nowitzki	28.2	2010-11	DAL	73	34.3	23.0	7.0	2.6	0.5	0.6	1.9	8.4	16.2	51.7	0.9	2.3	39.3	5.4	6.1	89.2	2,504	1,681	513	190	38	47	137	172	+541
Dirk Nowitzki	27.3	2002-03	DAL	80	39.0	25.1	9.9	3.0	1.4	1.0	1.9	8.6	18.6	46.3	1.9	4.9	37.9	6.0	6.9	88.1	3,117	2,011	791	239	111	82	152	206	+778
Dirk Nowitzki	26.8	2013-14	DAL	80	32.9	21.7	6.2	2.7	0.9	0.6	1.5	7.9	15.9	49.7	1.6	4.1	39.8	4.2	4.7	89.9	2,628	1,735	498	216	73	45	117	165	+323
Dirk Nowitzki	25.8	2016-17	DAL	54	26.4	14.2	6.5	1.5	0.6	0.7	0.9	5.5	12.6	43.7	1.5	3.9	37.8	1.8	2.1	87.5	1,424	769	353	82	30	38	51	113	-14
Dirk Nowitzki	25.5	2015-16	DAL	75	31.5	18.3	6.5	1.8	0.7	0.7	1.1	6.6	14.8	44.8	1.7	4.6	36.8	3.3	3.7	89.3	2,364	1,372	489	132	52	52	84	161	+257
Dirk Nowitzki	25.4	2001-02	DAL	76	38.0	23.4	9.9	2.4	1.1	1.0	1.9	7.9	16.6	47.7	1.8	4.6	39.7	5.8	6.8	85.3	2,891	1,779	755	186	83	77	145	222	+411
Dirk Nowitzki	24.8	2014-15	DAL	77	29.6	17.3	5.9	1.9	0.5	0.4	1.1	6.3	13.8	45.9	1.4	3.6	38.0	3.3	3.8	88.2	2,282	1,333	457	143	39	33	82	160	+240
Dirk Nowitzki	24.4	2003-04	DAL	77	37.9	21.8	8.7	2.7	1.2	1.4	1.8	7.9	17.0	46.2	1.3	3.8	34.1	4.8	5.5	87.7	2,915	1,680	670	207	92	104	135	216	+406
Dirk Nowitzki	24.2	2012-13	DAL	53	31.3	17.3	6.8	2.5	0.7	0.7	1.3	6.5	13.7	47.1	1.2	3.0	41.4	3.1	3.6	86.0	1,661	917	363	132	38	37	70	93	+58
Dirk Nowitzki	23.7	2000-01	DAL	82	38.1	21.8	9.2	2.1	1.0	1.2	1.9	7.2	15.2	47.4	1.8	4.8	38.7	5.5	6.6	83.8	3,125	1,784	754	173	79	101	156	245	+532
Dirk Nowitzki	22.6	2018-19	DAL	51	15.6	7.3	3.1	0.7	0.2	0.4	0.4	2.6	7.4	35.9	1.3	4.0	31.2	0.8	1.0	78.0	795	373	158	35	9	18	18	76	-67
Dirk Nowitzki	22.3	1998-99	DAL	47	20.4	8.2	3.4	1.0	0.6	0.6	1.6	2.9	7.1	40.5	0.3	1.4	20.6	2.1	2.7	77.3	958	385	162	47	29	27	73	105	-17
Dirk Nowitzki	21.2	1999-00	DAL	82	35.8	17.5	6.5	2.5	0.8	0.8	1.7	6.3	13.6	46.1	1.4	3.7	37.9	3.5	4.2	83.0	2,938	1,435	532	203	63	68	141	256	+92
Dirk Nowitzki	20.5	2017-18	DAL	77	24.7	12.0	5.7	1.6	0.6	0.6	0.7	4.5	9.8	45.6	1.8	4.4	40.9	1.3	1.4	89.8	1,900	927	438	120	43	45	51	146	-55