How many playoff appearances does the celtics have?

	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	1947-48	3	240.0	75.7		7.3			25.0	84.0	29.8				25.7	38.3	67.0	37.5				720	227		22				88
2	Celtics	1950-51	2	240.0	73.5	44.5	21.0			26.5	82.0	32.3				20.5	33.0	62.1	38.1				480	147	89	42				62
3	Celtics	1951-52	3	256.7	96.3	52.7	25.0			31.7	75.7	41.9				33.0	41.7	79.2	51.2				770	289	158	75				120
4	Celtics	1952-53	6	256.7	88.7	50.0	22.8			27.3	72.3	37.8				34.0	44.3	76.7	48.3				1,540	532	300	137				216
5	Celtics	1953-54	6	244.2	87.0	52.0	22.3			27.8	73.5	37.9				31.3	42.2	74.3	47.3				1,465	522	312	134				231
6	Celtics	1954-55	7	243.6	105.3	56.9	28.9			38.9	89.3	43.5				27.6	34.3	80.4	50.4				1,705	737	398	202				211
7	Celtics	1955-56	3	240.0	101.7	68.3	21.3			36.3	96.3	37.7				29.0	37.7	77.0	45.0				720	305	205	64				73
8	Celtics	1956-57	10	250.0	111.7	72.9	22.9			40.8	110.6	36.9				30.1	42.1	71.5	43.3				2,500	1,117	729	229				303
9	Celtics	1957-58	11	240.0	106.9	77.7	18.8			38.4	105.8	36.3				30.2	38.6	78.1	43.5				2,640	1,176	855	207				294
10	Celtics	1958-59	11	240.0	123.3	82.6	26.1			46.8	118.0	39.7				29.6	39.7	74.6	45.5				2,640	1,356	909	287				299
11	Celtics	1959-60	13	240.0	113.2	77.2	20.6			44.6	113.9	39.2				23.9	31.3	76.4	44.3				3,120	1,471	1,003	268				315
12	Celtics	1960-61	10	240.0	120.7	82.1	24.7			45.1	109.2	41.3				30.5	42.2	72.3	47.2				2,400	1,207	821	247				290
13	Celtics	1961-62	14	241.8	114.9	66.7	25.7			44.6	109.7	40.7				25.6	34.9	73.4	45.9				3,385	1,609	934	360				407
14	Celtics	1962-63	13	240.0	118.1	68.7	24.3			45.3	107.5	42.2				27.5	36.9	74.4	47.7				3,120	1,535	893	316				384
15	Celtics	1963-64	10	240.0	103.4	73.6	22.1			40.0	101.8	39.3				23.4	33.4	70.1	44.4				2,400	1,034	736	221				275
16	Celtics	1964-65	12	242.1	116.8	72.3	23.6			46.3	111.6	41.4				24.3	32.6	74.4	46.4				2,905	1,401	867	283				344
17	Celtics	1965-66	17	242.9	115.8	67.8	21.6			43.2	99.5	43.5				29.4	38.3	76.7	49.8				4,130	1,969	1,153	368				484
18	Celtics	1966-67	9	240.0	115.7	71.3	24.6			45.4	109.3	41.6				24.8	33.6	73.8	46.6				2,160	1,041	642	221				257
19	Celtics	1967-68	19	241.3	114.6	68.5	22.6			44.0	97.5	45.1				26.6	36.4	73.1	50.5				4,585	2,177	1,301	429				523
20	Celtics	1968-69	18	240.0	107.8	54.8	21.3			41.9	94.7	44.3				23.9	31.7	75.6	49.6				4,320	1,941	987	383				485
21	Celtics	1971-72	11	240.0	112.9	50.3	23.0			44.1	94.1	46.9				24.7	31.7	77.9	52.2				2,640	1,242	553	253				293
22	Celtics	1972-73	13	243.8	108.1	51.9	25.5			44.5	97.0	45.9				19.0	24.5	77.4	50.1				3,170	1,405	675	332				312
23	Celtics	1973-74	18	244.2	102.4	48.5	25.5	6.8	2.8	42.3	94.3	44.8				17.9	22.1	80.9	49.2	13.6	34.9	18.1	4,395	1,844	873	459	122	50	326	423
24	Celtics	1974-75	11	240.0	107.1	48.2	26.1	7.9	2.1	44.1	98.4	44.8				18.9	23.3	81.3	49.3	16.9	31.3	16.7	2,640	1,178	530	287	87	23	184	279
25	Celtics	1975-76	18	244.2	100.7	50.1	22.6	6.2	2.3	39.3	90.2	43.5				22.1	27.6	80.2	49.2	15.1	35.0	19.8	4,395	1,812	902	407	112	41	357	481
	Average		12.0	242.4	105.2	50.0	23.2	7.2	4.9	39.5	89.0	44.4	6.3	18.2	34.7	22.2	28.6	77.5	51.8	11.5	31.6	14.8	2904.4	1260.8	606.4	278.5	93.7	63.3	193.1	293.6
	Total		743	242.4	105.2	50.0	23.2	7.2	4.9	39.5	89.0	44.4	6.3	18.2	34.7	22.2	28.6	77.5	51.8	11.5	31.6	14.8	180,070	78,167	36,990	17,266	3,748	2,533	7,723	18,201