highest win percentage by a team in a decade since 1900 mlb

Since 1900, the New York Yankees have the best winning percentage by a team in a decade, winning 63.6 percent of the time in the 1930s.

	TEAM	W%	DECADE	W	L	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Yankees	.636	1930s	970	554	1,541	54,172	9,695	15,596	2,715	750	1,546	9,070	7,025	281	5,587	822		62,323	24,449	5,011	845			99	.288	.373	.451	.824
2	Pirates	.636	1900s	938	538	1,494	50,241	6,986	13,445	1,795	925	225	5,698	4,014	476	4,493	1,948		56,229	17,765	2,945	1,498				.268	.328	.354	.681
3	Dodgers	.633	2020s	551	319	870	29,540	4,599	7,501	1,521	128	1,293	4,421	3,274	395	7,301	521	116	33,559	13,157	2,942	66	284	160	532	.254	.334	.445	.779
4	Cardinals	.623	1940s	960	580	1,560	54,333	7,443	14,767	2,610	594	886	6,894	5,358	240	5,107	474		61,045	21,223	4,090	1,114			1,033	.272	.340	.391	.730
5	Yankees	.621	1950s	955	582	1,541	52,686	7,832	14,139	2,112	528	1,527	7,333	5,936	314	6,693	487	320	60,024	21,888	4,167	833	255	230	1,089	.268	.344	.415	.760
6	Yankees	.608	1920s	933	602	1,540	52,872	8,487	15,385	2,584	802	1,211	7,824	5,462	281	5,379	695		60,413	23,206	4,597	1,798				.291	.360	.439	.799
7	Yankees	.604	1940s	929	609	1,544	52,791	7,631	13,957	2,236	634	1,208	7,145	6,208	291	5,781	537		60,117	21,085	4,078	827			1,198	.264	.345	.399	.744
8	Giants	.598	1910s	889	597	1,507	49,907	6,549	13,343	2,015	734	338	5,579	4,140	545	4,882	2,293		56,004	17,840	3,087	1,412				.267	.330	.357	.688
9	Cubs	.598	1900s	879	592	1,502	49,666	6,247	12,627	1,735	593	172	4,951	3,904	484	4,945	2,292		55,799	16,064	2,500	1,745				.254	.315	.323	.638
10	Yankees	.597	2000s	965	651	1,618	56,090	8,834	15,502	3,008	201	2,167	8,489	6,265	711	10,299	1,117	374	63,805	25,413	5,376	296	443	409	1,409	.276	.354	.453	.807
11	Braves	.595	1990s	925	629	1,554	52,825	7,297	13,825	2,526	292	1,698	6,896	5,269	376	9,603	1,066	523	59,623	22,029	4,516	719	434	456	1,135	.262	.331	.417	.748
12	Reds	.592	1970s	953	657	1,611	54,911	7,525	14,406	2,527	391	1,439	7,004	6,145	287	9,222	1,392	514	62,501	22,032	4,357	679	479	706	1,182	.262	.337	.401	.738
13	Dodgers	.592	1950s	913	630	1,549	52,734	7,850	14,002	2,207	444	1,772	7,343	6,121	320	7,336	753	430	60,266	22,413	4,423	828	263	282	1,345	.266	.344	.425	.769
14	Orioles	.590	1970s	944	656	1,600	54,166	6,902	13,790	2,242	283	1,398	6,450	5,872	365	8,626	1,037	517	61,460	20,792	3,923	605	452	525	1,244	.255	.329	.384	.713
15	Indians	.588	1950s	904	634	1,545	52,304	7,312	13,571	2,049	334	1,537	6,899	6,089	323	7,156	392	324	59,806	20,899	3,920	805	285	159	1,196	.259	.339	.400	.738
16	Giants	.582	1920s	890	639	1,536	53,651	8,005	15,637	2,448	703	931	7,316	4,440	308	4,398	965		59,829	22,284	4,082	1,430				.291	.349	.415	.764
17	Dodgers	.581	1940s	894	646	1,554	53,623	7,537	14,349	2,546	547	789	6,937	6,057	218	5,287	772		60,986	20,356	3,882	1,088			1,038	.268	.344	.380	.724
18	Cubs	.579	1930s	889	646	1,544	53,966	7,747	15,240	2,796	597	913	7,237	4,868	296	5,353	593		60,356	21,969	4,306	1,226			124	.282	.345	.407	.752
19	Red Sox	.579	1910s	857	624	1,507	48,995	6,145	12,720	2,030	722	232	5,170	4,792	446	5,189	1,505		56,396	16,890	2,984	2,163				.260	.331	.345	.676
20	Pirates	.572	1920s	877	656	1,543	53,754	7,836	15,817	2,426	1,042	486	7,090	4,219	290	3,615	1,268		59,986	21,785	3,954	1,723				.294	.349	.405	.754
21	Astros	.570	2020s	495	374	869	29,581	4,132	7,576	1,477	89	1,098	3,972	2,758	357	6,559	443	133	32,995	12,525	2,664	66	233	108	673	.256	.325	.423	.748
22	Giants	.569	1930s	868	657	1,535	54,097	7,530	15,212	2,379	502	1,140	7,029	4,134	272	4,621	388		59,495	22,015	4,021	992			153	.281	.335	.407	.742
23	Pirates	.569	1970s	916	695	1,612	55,933	7,276	15,031	2,489	534	1,306	6,778	4,601	338	8,577	1,090	505	61,981	22,506	4,329	629	480	747	1,176	.269	.325	.402	.728
24	Yankees	.569	2010s	921	699	1,620	55,272	7,909	14,174	2,658	230	2,168	7,568	5,611	602	12,456	913	272	62,211	23,796	5,056	248	478	253	1,203	.256	.329	.431	.760
25	Red Sox	.568	2000s	920	699	1,619	56,337	8,647	15,546	3,430	289	1,944	8,246	6,274	623	10,556	763	291	64,020	25,386	5,663	239	547	461	1,336	.276	.352	.451	.802