Semi-supervised graph labelling reveals increasing partisanship in the United States Congress

Applied Network Science

Table 2 Years covered, total number of members (nodes), number of Democrats (excluding leaders), number of Republicans (excluding leaders), number of Democrat leaders, number of Republican leaders, and number of roll call votes for each Senate

Congress	Years	Members			Leaders		Votes
		Total	Dem	Rep	Dem	Rep
74	1935 - 37	97	71	24	1	1	134
75	1937 - 39	98	80	15	2	1	130
76	1939 - 41	100	72	26	1	1	190
77	1941 - 43	106	74	30	1	1	122
78	1943 - 45	102	59	40	1	2	188
79	1945 - 47	102	59	41	1	1	151
80	1947 - 49	97	45	50	1	1	200
81	1949 - 51	107	59	46	1	1	375
82	1951 - 53	98	50	45	1	2	251
83	1953 - 55	109	52	54	1	2	159
84	1955 - 57	98	50	46	1	1	134
85	1957 - 59	101	52	47	1	1	149
86	1959 - 61	103	66	35	1	1	249
87	1961 - 63	105	64	39	1	1	272
88	1963 - 65	102	68	32	1	1	362
89	1965 - 67	103	69	32	1	1	295
90	1967 - 69	101	63	36	1	1	372
91	1969 - 71	102	57	42	1	2	328
92	1971 - 73	99	54	43	1	1	566
93	1973 - 75	100	56	42	1	1	582
94	1975 - 77	99	60	37	1	1	694
95	1977 - 79	103	64	37	1	1	495
96	1979 - 81	100	58	40	1	1	619
97	1981 - 83	100	45	53	1	1	471
98	1983 - 85	101	45	54	1	1	299
99	1985 - 87	101	46	53	1	1	355
100	1987 - 89	101	54	45	1	1	335
101	1989 - 91	101	55	44	1	1	280
102	1991 - 93	102	57	43	1	1	301
103	1993 - 95	101	56	43	1	1	465
104	1995 - 97	103	47	53	1	2	610
105	1997 - 99	100	44	54	1	1	329
106	1999 - 01	102	45	55	1	1	378
107	2001 - 03	100	49	49	1	1	332
108	2003 - 05	99	47	50	1	1	402
109	2005 - 07	100	44	54	1	1	376
110	2007 - 09	101	49 ^*	50	1	1	369
111	2009 - 11	110	65	43	1	1	512
112	2011 - 13	101	52	47	1	1	267
113	2013 - 15	103	56	45	1	1	433
114	2015 - 17	98	43	53	1	1	303
115	2017 - 19	103	47	54	1	1	378

^*Democrats formed a working majority in coalition with two Independent Senators
Senates where the number of Democrats is shown in bold had a Democrat majority, and Senates where the number of Republicans is shown in bold had a Republican majority