How many NBA teams in 1991?

	TEAM	SEASON	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	AST	STL	BLK	TOV	PF
1	Celtics	1990-91	82	241.5	111.5	46.2	26.3	8.2	6.9	45.1	88.0	51.2	1.3	4.2	31.5	20.1	24.4	82.4	56.5	13.3	32.9	16.1	19,805	9,145	3,785	2,160	672	565	1,320	1,695
2	Knicks	1990-91	82	243.4	103.1	42.5	26.5	7.8	5.1	40.3	83.2	48.5	2.3	6.8	33.2	20.2	26.2	77.0	54.4	12.8	29.7	16.8	19,955	8,455	3,489	2,172	638	418	1,379	1,764
3	Warriors	1990-91	82	241.5	116.6	41.7	23.8	9.8	4.6	43.5	89.6	48.5	3.3	9.8	33.7	26.4	33.7	78.3	55.9	13.6	28.1	16.6	19,805	9,564	3,419	1,954	803	378	1,359	2,207
4	Pistons	1990-91	82	241.5	100.1	44.6	22.3	5.9	4.5	39.0	83.8	46.5	1.6	5.4	29.8	20.6	27.0	76.3	52.3	14.7	29.9	14.4	19,805	8,205	3,658	1,825	487	367	1,181	1,869
5	Lakers	1990-91	82	241.8	106.3	42.9	25.5	7.8	4.7	40.8	84.3	48.4	2.8	9.1	30.4	22.0	27.6	79.8	55.1	13.1	29.8	14.7	19,830	8,717	3,518	2,091	642	384	1,203	1,524
6	Kings	1990-91	82	240.3	96.7	39.6	24.3	7.7	6.3	37.6	83.1	45.3	2.6	7.0	37.4	18.8	25.7	73.2	51.2	12.5	27.0	15.5	19,705	7,928	3,245	1,991	631	513	1,272	2,075
7	76ers	1990-91	82	244.9	105.4	42.4	22.2	8.3	5.8	40.1	84.5	47.5	2.4	7.5	31.6	22.8	28.9	79.0	54.2	12.0	30.4	15.0	20,080	8,641	3,480	1,824	678	479	1,230	1,629
8	Hawks	1990-91	82	240.9	109.8	44.6	22.7	8.9	4.6	40.8	88.1	46.4	3.3	10.2	32.4	24.8	31.0	80.0	54.0	15.1	29.5	15.0	19,755	9,003	3,655	1,864	729	374	1,231	1,768
9	Bullets	1990-91	82	242.1	101.4	43.5	25.4	7.2	5.7	41.3	88.6	46.6	0.7	3.5	19.4	18.0	24.7	72.9	50.9	14.3	29.1	16.6	19,855	8,313	3,563	2,081	588	468	1,359	1,927
10	Bulls	1990-91	82	240.9	110.0	42.6	27.0	10.0	5.3	44.3	86.9	51.0	1.9	5.2	36.6	19.6	25.7	76.0	56.0	14.0	28.6	14.4	19,755	9,024	3,490	2,212	822	438	1,184	1,751
11	Spurs	1990-91	82	241.8	107.1	46.2	26.1	8.2	7.0	41.6	85.2	48.8	1.0	3.6	27.3	23.0	30.0	76.6	54.4	13.8	32.4	17.6	19,830	8,782	3,788	2,140	670	571	1,445	1,896
12	Nuggets	1990-91	82	240.6	119.9	49.4	24.5	10.4	5.0	47.6	108.1	44.0	3.7	12.9	28.3	21.0	27.6	76.3	49.8	18.5	30.9	16.2	19,730	9,828	4,050	2,005	856	406	1,332	2,235
13	Pacers	1990-91	82	241.5	111.7	41.4	26.6	8.0	4.4	42.1	85.3	49.3	3.0	9.1	33.2	24.5	30.2	81.1	56.6	12.4	29.0	16.5	19,805	9,159	3,394	2,181	658	357	1,355	2,088
14	Nets	1990-91	82	241.8	102.9	45.7	21.7	9.1	7.3	40.4	91.0	44.4	2.0	7.1	27.5	20.2	27.4	73.9	50.0	17.1	28.6	17.4	19,830	8,441	3,748	1,782	748	600	1,423	1,954
15	Rockets	1990-91	82	242.1	106.7	46.1	23.2	9.7	5.0	41.5	88.9	46.7	3.9	12.1	32.0	19.9	26.8	74.1	53.0	15.5	30.6	17.1	19,855	8,753	3,783	1,906	796	409	1,402	1,874
16	SuperSonics	1990-91	82	242.4	106.6	41.4	24.9	10.5	4.6	42.7	86.8	49.2	1.7	5.2	31.9	19.6	26.1	75.0	54.2	14.9	26.5	17.1	19,880	8,744	3,395	2,042	861	380	1,404	1,973
17	Bucks	1990-91	82	242.1	106.4	39.5	25.3	10.9	4.0	40.7	84.7	48.0	3.1	9.2	34.1	21.9	27.3	80.1	55.0	13.2	26.4	16.1	19,855	8,727	3,241	2,075	894	330	1,321	2,033
18	Suns	1990-91	82	240.6	114.0	45.5	26.9	8.4	6.5	43.6	87.8	49.6	1.7	5.3	31.9	25.2	32.7	77.0	55.8	13.8	31.7	15.9	19,730	9,348	3,730	2,209	687	535	1,302	1,850
19	Clippers	1990-91	82	241.5	103.5	45.7	25.8	8.8	6.2	41.4	89.2	46.4	1.4	5.3	26.0	19.5	27.7	70.2	51.1	15.2	30.5	17.5	19,805	8,491	3,746	2,119	725	507	1,438	2,043
20	Cavaliers	1990-91	82	241.8	101.7	40.7	27.3	7.8	5.5	39.7	83.6	47.5	2.0	5.8	33.4	20.3	26.5	76.5	53.4	12.3	28.4	15.6	19,830	8,343	3,340	2,240	643	450	1,281	1,672
21	Trail Blazers	1990-91	82	242.7	114.7	45.9	27.5	8.8	5.0	43.6	89.9	48.5	4.2	11.0	37.7	23.3	31.0	75.3	55.4	14.7	31.2	16.0	19,905	9,407	3,763	2,254	724	410	1,309	1,975
22	Jazz	1990-91	82	241.2	104.0	40.7	27.0	8.0	5.5	39.2	79.7	49.2	1.8	5.6	32.3	23.8	30.1	78.9	55.9	10.6	30.2	15.9	19,780	8,527	3,341	2,217	652	451	1,305	1,796
23	Mavericks	1990-91	82	241.5	99.9	40.8	22.2	7.1	4.8	39.6	84.0	47.1	2.4	7.3	32.2	18.4	24.2	76.1	52.8	12.0	28.8	14.5	19,805	8,195	3,344	1,821	581	397	1,186	1,840
24	Heat	1990-91	82	241.2	101.8	43.1	23.2	9.2	4.7	40.0	87.1	45.9	1.7	5.7	30.2	20.1	28.1	71.5	51.2	15.0	28.1	18.9	19,780	8,349	3,534	1,904	756	387	1,551	2,080
25	Timberwolves	1990-91	82	242.7	99.6	41.3	23.0	8.7	5.4	39.8	88.7	44.9	1.3	4.6	28.3	18.7	25.4	73.5	49.9	15.5	25.8	13.0	19,905	8,169	3,388	1,885	712	440	1,062	1,864