How many NHL teams were there in 1979-80 to 1983-84?

	TEAM	GP	W	L	T	PTS	PTS%	G	GA	DIFF	PP%	PK%	S/GP	S%	SA/GP	SV%
1	Canadiens	400	215	123	62	492	.615	1,656	1,276	380	23.9	79.5	32.16	12.9	27.28	.883
2	Maple Leafs	400	137	206	57	331	.414	1,520	1,791	-271	22.9	75.6	30.72	12.4	33.75	.867
3	Bruins	400	225	123	52	502	.628	1,612	1,280	332	23.9	80.9	29.59	13.6	25.13	.873
4	Rangers	400	184	159	57	425	.531	1,556	1,498	58	22.6	78.1	29.90	13.0	29.45	.873
5	Black Hawks	400	172	163	65	409	.511	1,492	1,507	-15	23.7	77.0	31.36	11.9	32.17	.883
6	Red Wings	400	118	219	63	299	.374	1,351	1,663	-312	19.0	74.3	30.57	11.1	28.89	.856
7	Kings	400	147	186	67	361	.451	1,558	1,713	-155	23.4	71.8	30.64	12.7	30.85	.861
8	North Stars	400	187	134	79	453	.566	1,614	1,438	176	24.6	80.0	32.09	12.6	31.13	.885
9	Flyers	400	220	116	64	504	.630	1,641	1,346	295	22.4	78.1	34.42	11.9	28.35	.881
10	Penguins	400	125	221	54	304	.380	1,374	1,769	-395	22.4	74.6	30.74	11.2	32.16	.862
11	Blues	400	168	173	59	395	.494	1,511	1,540	-29	21.8	79.4	29.98	12.6	31.15	.876
12	Sabres	400	211	117	72	494	.618	1,585	1,266	319	22.7	81.9	29.91	13.2	26.85	.882
13	Canucks	400	147	176	77	371	.464	1,444	1,505	-61	21.9	77.4	30.44	11.9	29.96	.874
14	Flames	400	169	159	72	410	.513	1,577	1,543	34	24.6	79.4	29.07	13.6	32.61	.882
15	Islanders	400	233	114	53	519	.649	1,680	1,252	428	25.9	80.4	29.89	14.1	30.72	.898
16	Devils	400	93	247	60	246	.308	1,194	1,702	-508	18.0	75.5	27.48	10.9	31.17	.863
17	Capitals	400	166	169	65	397	.496	1,480	1,457	23	20.3	78.9	30.30	12.2	29.52	.877
18	Oilers	400	209	130	61	479	.599	1,916	1,573	343	24.9	78.3	31.56	15.2	31.49	.875
19	Whalers	400	116	212	72	304	.380	1,408	1,758	-350	21.1	75.1	29.19	12.1	33.21	.868
20	Nordiques	400	164	169	67	395	.494	1,621	1,590	31	22.8	76.6	28.45	14.2	30.63	.870
21	Jets	400	126	216	58	310	.388	1,430	1,753	-323	20.6	74.9	30.71	11.6	32.67	.866