how many nba teams lost a game after having a 20 point lead

The Boston Celtics have come up short 2,511 times when putting up 20.0+ points per game.

Interpreted as:

How many NBA teams lost in the regular season a game after having a 20 or higher point lead?

	TEAM	L	PPG	GP	MPG	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	2,511	105.5	6,221	241.6	50.2	23.8	8.1	4.9	40.4	90.5	44.6	6.3	17.6	35.7	21.0	27.7	75.9	51.4	12.2	31.7	1,503,065	656,151	300,660	148,166	34,133	20,471	144,853
2	Stags	92	79.0	237	241.6		14.6			30.3	95.5	31.7				18.5	27.7	66.6	36.7			57,255	18,727		3,454			6,319
3	Rebels	30	70.9	60	242.1		8.2			27.9	95.0	29.4				15.1	23.8	63.2	33.6			14,525	4,251		494			1,246
4	Falcons	40	63.3	60	240.4		8.0			24.0	97.4	24.6				15.4	24.9	61.8	29.2			14,425	3,797		482			1,351
5	Knicks	3,169	102.3	6,212	241.9	47.9	22.3	7.9	4.3	39.1	87.7	44.5	6.0	16.8	35.4	20.6	27.7	74.5	51.2	12.2	30.5	1,502,705	635,410	285,977	138,315	33,280	18,307	149,447
6	Warriors	3,181	105.9	6,212	241.6	50.2	23.5	8.8	5.1	40.5	91.3	44.3	6.6	18.2	36.2	21.0	28.3	74.1	51.0	13.3	31.1	1,500,580	657,999	299,914	146,146	37,076	21,299	146,196
7	Ironmen	45	61.2	60	240.8		4.5			22.4	82.7	27.1				16.4	25.1	65.3	32.7			14,450	3,674		272			1,360
8	Steam Rollers	122	73.7	168	241.6		11.0			27.7	93.1	29.7				18.3	27.9	65.8	35.0			40,595	12,375		1,854			3,669
9	Bombers	115	72.0	237	242.4		12.9			26.6	86.0	30.9				18.8	27.7	67.9	36.7			57,455	17,053		3,064			5,360
10	Huskies	38	66.6	60	240.4		7.7			25.3	94.5	26.7				16.1	25.9	62.2	31.4			14,425	3,996		463			1,271
11	Capitols	114	77.2	271	241.3	43.8	12.2			28.0	90.2	31.1				21.2	28.8	73.5	37.5			65,390	20,920	1,534	3,296			6,825
12	Bullets	292	79.8	450	242.2	52.4	18.2			28.2	82.6	34.2				23.4	32.7	71.5	41.2			108,970	35,901	14,367	8,170			11,975
13	Pistons	3,214	102.5	6,105	241.6	48.4	22.1	7.8	4.9	39.0	88.3	44.2	5.4	15.6	34.8	21.1	28.5	74.0	50.8	13.0	30.3	1,474,875	625,615	289,018	134,681	32,993	20,684	143,479
14	Jets	42	74.7	60	240.4		20.4			27.0	89.5	30.2				20.7	30.0	69.0	36.4			14,425	4,482		1,225			1,393
15	Lakers	2,493	106.8	6,110	241.7	49.2	24.1	8.3	5.5	40.8	89.0	45.8	5.8	16.8	34.7	21.6	29.0	74.5	52.5	12.5	31.7	1,476,950	652,271	294,386	147,223	34,925	23,150	137,674
16	Kings	3,318	105.1	6,112	241.7	47.8	23.6	8.2	4.6	40.1	88.8	45.2	5.7	16.0	35.6	21.4	28.5	75.0	51.9	12.3	30.6	1,477,280	642,456	286,130	144,504	34,680	19,338	145,854
17	Packers	27	87.3	64	244.3		19.4			30.4	97.7	31.1				26.6	36.6	72.7	38.4			15,635	5,589		1,240			1,806
18	Nuggets	51	77.7	62	240.0		16.8			27.9	83.6	33.4				21.9	32.2	67.8	39.7			14,880	4,817		1,044			1,692
19	Olympians	137	81.1	269	242.6	45.8	20.0			29.5	81.0	36.4				22.1	30.8	71.8	42.9			65,260	21,817	9,393	5,368			6,596
20	Red Skins	40	82.4	62	240.0		20.6			27.9	81.0	34.4				26.7	37.7	70.7	42.2			14,880	5,108		1,279			1,766
21	76ers	2,909	104.8	6,048	241.7	48.7	22.8	8.8	5.5	39.5	88.3	44.7	5.1	14.9	34.4	22.6	30.1	75.1	51.6	12.7	30.8	1,461,970	633,804	291,654	137,953	36,946	23,107	140,663
22	Hawks	3,064	103.3	6,047	241.6	48.4	22.9	8.3	5.0	39.0	87.6	44.6	5.8	16.5	35.1	21.7	29.0	74.8	51.5	13.0	30.3	1,460,825	624,552	289,280	138,216	35,178	21,295	142,876
23	Hawks	43	79.4	62	240.8		21.4			28.2	79.1	35.6				23.0	32.3	71.4	42.5			14,930	4,921		1,324			1,780
24	Wizards	2,899	104.9	5,193	241.6	46.7	22.8	7.9	5.0	40.7	89.1	45.6	5.1	14.9	34.4	19.9	26.8	74.3	52.0	12.5	30.7	1,254,770	544,601	242,700	118,619	33,390	21,008	117,530
25	Bulls	2,354	103.0	4,786	241.8	45.4	23.9	8.0	4.8	39.7	86.4	45.9	5.3	14.9	35.4	19.6	25.9	75.8	52.7	12.8	31.1	1,157,340	493,095	217,219	114,150	33,571	20,328	106,755