how many different national champions have there been since 1987

The Washington Nationals have won 1 championship since 1987.

	TEAM	Champs	SEASON	G	W%	W	L	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Expos	0	1987	162	.562	91	71	5,527	741	1,467	310	39	120	695	501	35	918	166	74	6,162	2,215	469	57	42	77	100	.265	.328	.401	.729
2	Expos	0	1988	163	.500	81	81	5,573	628	1,400	260	48	107	575	454	32	1,053	189	89	6,169	2,077	415	66	44	71	120	.251	.309	.373	.682
3	Expos	0	1989	162	.500	81	81	5,482	632	1,353	267	30	100	587	572	35	958	160	70	6,206	1,980	397	71	46	83	119	.247	.319	.361	.681
4	Expos	0	1990	162	.525	85	77	5,453	662	1,363	227	43	114	607	576	26	1,024	235	99	6,189	2,018	384	87	47	67	96	.250	.322	.370	.692
5	Expos	0	1991	161	.441	71	90	5,412	579	1,329	236	42	95	536	484	28	1,056	221	100	6,035	1,934	373	64	47	51	97	.246	.308	.357	.666
6	Expos	0	1992	162	.537	87	75	5,477	648	1,381	263	37	102	601	463	43	976	196	63	6,120	2,024	402	82	55	43	104	.252	.313	.370	.682
7	Expos	0	1993	163	.580	94	68	5,493	732	1,410	270	36	122	682	542	48	860	228	56	6,233	2,118	428	100	50	65	95	.257	.326	.386	.712
8	Expos	0	1994	114	.649	74	40	4,000	585	1,111	246	30	108	542	379	40	669	137	36	4,514	1,741	384	53	42	39	77	.278	.343	.435	.778
9	Expos	0	1995	144	.458	66	78	4,905	621	1,268	265	24	118	572	400	56	901	120	49	5,451	1,935	407	58	32	43	107	.259	.320	.394	.714
10	Expos	0	1996	162	.543	88	74	5,505	741	1,441	297	27	148	696	492	58	1,077	108	34	6,170	2,236	472	79	36	49	119	.262	.327	.406	.733
11	Expos	0	1997	162	.481	78	84	5,526	691	1,423	339	34	172	659	420	73	1,084	75	46	6,131	2,346	545	72	40	40	95	.258	.316	.425	.741
12	Expos	0	1998	162	.401	65	97	5,418	644	1,348	280	32	147	602	439	60	1,058	91	46	6,041	2,133	459	87	37	31	109	.249	.310	.394	.704
13	Expos	0	1999	162	.420	68	94	5,559	718	1,473	320	47	163	680	438	53	939	70	51	6,149	2,376	530	71	28	39	138	.265	.323	.427	.751
14	Expos	0	2000	162	.414	67	95	5,535	738	1,475	310	35	178	705	476	29	1,048	58	48	6,152	2,389	523	78	34	53	111	.266	.326	.432	.758
15	Expos	0	2001	162	.420	68	94	5,379	670	1,361	320	28	131	622	478	60	1,071	101	51	6,026	2,130	479	64	45	59	151	.253	.319	.396	.715
16	Expos	0	2002	162	.512	83	79	5,479	735	1,432	300	36	162	695	575	46	1,104	118	64	6,250	2,290	498	108	42	85	123	.261	.334	.418	.752
17	Expos	0	2003	162	.512	83	79	5,437	711	1,404	294	25	144	682	522	45	990	100	39	6,116	2,180	463	72	40	58	143	.258	.326	.401	.727
18	Expos	0	2004	162	.414	67	95	5,474	635	1,361	276	27	151	605	496	35	925	109	38	6,138	2,144	454	100	33	51	115	.249	.313	.392	.705
19	Nationals	0	2005	162	.500	81	81	5,426	639	1,367	311	32	117	615	491	89	1,090	45	45	6,142	2,093	460	91	45	55	130	.252	.322	.386	.708
20	Nationals	0	2006	162	.438	71	91	5,495	746	1,437	322	22	164	695	594	69	1,156	123	62	6,283	2,295	508	76	49	66	118	.262	.338	.418	.756
21	Nationals	0	2007	162	.451	73	89	5,520	673	1,415	309	31	123	646	524	53	1,128	69	23	6,201	2,155	463	63	41	38	143	.256	.325	.390	.715
22	Nationals	0	2008	161	.366	59	102	5,491	641	1,376	269	26	117	608	534	67	1,095	81	43	6,192	2,048	412	64	36	21	153	.251	.323	.373	.696
23	Nationals	0	2009	162	.364	59	103	5,493	710	1,416	271	38	156	685	617	56	1,208	73	40	6,272	2,231	465	64	42	39	133	.258	.337	.406	.743
24	Nationals	0	2010	162	.426	69	93	5,418	655	1,355	250	31	149	634	503	60	1,220	110	41	6,099	2,114	430	71	47	36	125	.250	.318	.390	.708
25	Nationals	0	2011	161	.497	80	81	5,441	624	1,319	257	22	154	594	470	65	1,323	106	38	6,090	2,082	433	82	32	40	103	.242	.309	.383	.691
	Total	1		6,149	.484	2,973	3,174	208,116	26,468	53,105	10,760	1,150	5,717	25,009	19,261	2,061	42,967	4,550	1,804	233,454	83,316	17,627	2,420	1,596	1,737	4,503	.255	.322	.400	.722