How many NBA teams were there from 60s to 70s?

	TEAM	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	MIN	PTS	REB	AST	STL	BLK	PF
1	Celtics	1,623	241.1	113.2					45.0			1.8	4.7	38.4	23.1	30.7	75.4				391,270	183,691
2	Pistons	1,623	241.2	110.4					43.5			0.4			23.4	32.1	73.0				391,495	179,188
3	Lakers	1,625	241.4	113.3					44.5			0.2	1.1	15.6	24.3	32.7	74.4				392,350	184,134
4	Kings	1,622	241.2	112.5					44.1			0.2			24.2	32.0	75.9				391,305	182,479					42,026
5	76ers	1,625	241.1	114.1					44.4			0.2			25.3	34.3	73.7				391,850	185,488					42,175
6	Hawks	1,628	241.1	110.6					42.9			0.1			24.7	33.4	73.9				392,495	180,056					42,521
7	Knicks	1,625	241.4	110.3					44.1			0.4			22.2	30.2	73.5				392,225	179,254
8	Warriors	1,625	241.4	111.9					44.7			0.3	1.6	19.7	22.6	31.3	72.2				392,350	181,871					39,870
9	Bullets	1,499	241.4	110.9					44.0			0.6			22.9	31.5	72.6				361,810	166,288
10	Bulls	1,102	241.4	105.5					41.4			0.5	2.9	17.6	22.7	30.0	75.7				266,030	116,268					26,449
11	SuperSonics	1,022	241.2	108.9					43.3			0.7	2.1	34.6	22.3	30.2	73.8				246,530	111,286					25,524
12	Rockets	1,021	241.1	110.4					44.1			0.4			22.2	29.1	76.0				246,115	112,701					25,735
13	Bucks	942	241.4	110.2					45.4			0.6			19.4	25.9	74.8				227,380	103,841
14	Suns	942	241.4	110.8	48.2	25.4			43.5	94.1	46.2	0.5	2.6	18.3	23.8	31.4	75.8	51.3			227,380	104,357	45,447	23,908			23,574
15	Clippers	779	241.0	106.8					42.9			1.9	5.4	34.5	21.0	28.1	74.7				187,735	83,208					19,028
16	Cavaliers	777	241.3	103.4	46.6	23.7			42.3			0.5			18.8	25.2	74.8				187,480	80,330	36,226	18,382			18,436
17	Trail Blazers	779	241.1	107.4	47.7	25.3	9.6	5.2	43.1	92.5	46.6	0.2	1.5	16.7	21.2	28.4	74.7	51.1	14.5	32.4	187,785	83,701	37,163	19,738	5,139	2,788	19,516
18	Jazz	449	241.2	105.0					41.9			0.3	1.1	27.3	21.2	27.9	76.0				108,310	47,142					11,313
19	Pacers	284	241.5	108.2	47.4	24.5			43.2	94.2	45.9	0.8			21.7	28.9	75.2	50.6			68,585	30,728	13,465	6,955			7,269
20	Spurs	284	241.4	116.7	44.7	27.4	10.1	6.0	46.7	93.9	49.7	0.5	2.5	21.3	23.3	29.2	79.9	54.7			68,560	33,152	12,689	7,773	2,882	1,691	6,891
21	Nuggets	286	241.1	111.1	48.1	26.5			43.1	90.3	47.7	1.0	2.9	34.2	24.8	33.6	73.8	52.8			68,965	31,778	13,749	7,584			7,329
22	Nets	284	241.3	103.4					41.0			0.9			21.3	28.9	73.6				68,535	29,376					7,807