How many NBA teams were there in 1959-60 to 1972-73?

	TEAM	GP	MPG	PPG	RPG	APG	FGM	FGA	FG%	FTM	FTA	FT%	TS%	MIN	PTS	REB	AST	PF
1	Celtics	1,127	241.0	116.3	67.2	24.2	46.0	107.1	42.9	24.4	32.9	74.3	47.8	271,630	131,102	75,760	27,247	28,740
2	Knicks	1,127	241.2	112.3	59.2	22.9	44.2	99.6	44.4	23.9	32.9	72.8	49.2	271,830	126,590	66,768	25,826	29,352
3	Warriors	1,127	241.5	114.0	67.0	23.4	44.7	103.9	43.0	24.5	34.6	71.0	47.8	272,155	128,437	75,475	26,351	27,483
4	Pistons	1,127	241.4	112.3	61.8	20.9	43.5	100.7	43.2	25.4	35.1	72.3	48.4	272,005	126,572	69,671	23,499	28,878
5	Lakers	1,127	241.6	115.2	62.8	23.7	44.3	98.9	44.8	26.5	35.9	73.8	50.2	272,255	129,776	70,722	26,728	26,688
6	Kings	1,127	241.2	115.3	61.2	24.4	44.8	99.0	45.2	25.8	34.3	75.1	50.5	271,855	129,979	68,952	27,555	29,300
7	76ers	1,127	240.9	117.4	63.9	23.2	45.3	102.9	44.1	26.8	36.5	73.3	49.4	271,505	132,349	71,962	26,195	29,734
8	Hawks	1,127	241.0	113.0	61.6	24.0	43.5	98.3	44.3	26.0	35.4	73.3	49.6	271,580	127,367	69,403	27,073	29,045
9	Bullets	973	241.3	113.3	62.0	21.5	44.4	100.5	44.2	24.5	33.8	72.5	49.1	234,795	110,235	60,321	20,952	24,120
10	Bulls	573	241.3	109.7	55.9	23.3	42.7	98.0	43.6	24.2	32.2	75.4	48.9	138,270	62,880	32,041	13,336	13,904
11	Rockets	492	240.8	113.7	57.7	23.2	44.8	103.7	43.2	24.1	32.9	73.3	48.1	118,455	55,928	28,409	11,435	12,463
12	SuperSonics	492	241.1	112.6	54.7	24.6	43.9	97.4	45.0	24.8	33.3	74.4	50.2	118,630	55,398	26,888	12,122	12,360
13	Bucks	410	240.9	113.9	53.7	26.1	46.4	96.5	48.0	21.2	28.5	74.2	52.2	98,775	46,680	22,004	10,685	9,630
14	Suns	410	241.5	114.6	52.3	24.0	43.7	97.4	44.9	27.1	35.9	75.4	50.6	99,025	46,970	21,437	9,844	10,439
15	Braves	246	241.2	103.6	50.4	24.1	42.2	94.7	44.5	19.3	27.2	71.1	48.6	59,340	25,491	12,397	5,939	6,376
16	Cavaliers	246	240.9	103.5	49.4	25.3	41.4	96.5	42.9	20.7	27.9	74.2	47.6	59,265	25,465	12,143	6,231	5,991
17	Trail Blazers	246	241.0	109.5	49.3	26.1	43.8	98.6	44.4	21.9	29.7	73.9	49.1	59,290	26,933	12,134	6,419	5,867