Patent counts for nber category 4 Electrical & Electronic

year	in force	issued
1840	53	5
1841	62	9
1842	70	11
1843	71	3
1844	75	4
1845	75	3
1846	75	3
1847	78	6
1848	86	12
1849	92	14
1850	107	18
1851	125	23
1852	132	19
1853	144	14
1854	169	30
1855	192	32
1856	221	40
1857	260	42
1858	336	80
1859	411	78
1860	505	97
1861	571	72
1862	654	95
1863	734	94
1864	800	85
1865	894	116
1866	1,036	161
1867	1,219	197
1868	1,382	193
1869	1,588	239
1870	1,768	219
1871	1,987	261
1872	2,157	250
1873	2,284	205
1874	2,400	213
1875	2,673	273
1876	2,977	304
1877	3,222	247
1878	3,475	323
1879	3,730	350
1880	4,118	482
1881	4,649	616
1882	5,528	995
1883	6,500	1,138
1884	7,175	867
1885	8,006	1,024
1886	8,788	1,021
1887	9,462	893
1888	10,257	1,056
1889	11,374	1,367
1890	12,886	1,717
1891	14,190	1,517
1892	15,348	1,431
1893	16,584	1,540
1894	17,803	1,468
1895	18,794	1,312
1896	19,799	1,355
1897	20,642	1,325
1898	21,085	1,059
1899	21,301	1,211
1900	21,550	1,411
1901	22,361	1,654
1902	23,073	1,736
1903	24,125	2,073
1904	25,220	1,988
1905	26,000	1,852
1906	26,375	1,726
1907	26,947	2,289
1908	27,564	2,134
1909	28,697	2,564
1910	29,594	2,437
1911	30,652	2,557
1912	32,064	2,693
1913	33,099	2,390
1914	34,838	3,064
1915	37,223	3,444
1916	39,542	3,530
1917	41,718	3,620
1918	43,387	3,290
1919	44,933	3,282
1920	46,065	3,205
1921	47,184	3,107
1922	48,424	3,092
1923	49,704	3,048
1924	51,427	3,970
1925	53,852	4,559
1926	55,698	4,410
1927	57,548	4,287
1928	59,884	4,893
1929	62,079	4,888
1930	64,474	4,785
1931	66,548	5,138
1932	68,656	5,552
1933	70,916	5,790
1934	72,760	5,553
1935	74,263	4,704
1936	75,441	4,460
1937	76,543	4,307
1938	77,878	4,442
1939	80,287	5,501
1940	82,582	5,412
1941	84,423	5,742
1942	85,613	5,749
1943	85,177	3,974
1944	84,289	3,399
1945	82,339	3,063
1946	80,801	3,230
1947	79,290	3,274
1948	78,453	4,301
1949	78,961	6,060
1950	79,623	6,452
1951	80,214	6,255
1952	81,512	5,891
1953	82,554	5,502
1954	83,155	4,908
1955	83,053	4,340
1956	84,622	7,070
1957	86,083	6,873
1958	88,183	7,842
1959	91,269	8,835
1960	95,454	8,159
1961	99,616	7,561
1962	105,284	8,795
1963	108,941	6,823
1964	113,110	7,443
1965	119,959	11,150
1966	125,980	12,081
1967	130,512	10,984
1968	134,023	9,872
1969	140,295	12,057
1970	146,937	12,144
1971	156,782	14,753
1972	164,455	12,013
1973	169,818	12,519
1974	175,068	12,037
1975	178,062	10,836
1976	180,310	11,083
1977	182,855	10,704
1978	185,681	10,387
1979	184,555	7,799
1980	187,386	9,524
1981	190,162	10,219
1982	189,009	9,997
1983	186,617	9,689
1984	187,344	11,711
1985	190,011	12,540
1986	190,060	12,323
1987	192,905	15,946
1988	190,919	14,130
1989	194,492	17,152
1990	196,068	16,152
1991	198,460	17,565
1992	200,412	17,784
1993	200,867	17,447
1994	202,732	18,781
1995	202,896	19,404
1996	207,163	20,558
1997	209,234	20,185
1998	218,198	27,030
1999	229,217	28,547
2000	249,758	31,769
2001	272,624	35,194
2002	295,980	37,185
2003	319,768	38,341
2004	342,755	39,221
2005	360,457	34,709
2006	383,204	40,783
2007	403,056	37,919
2008	422,536	38,271
2009	443,027	41,165
2010	468,400	51,229
2011	494,054	50,945
2012	523,127	54,474
2013	554,888	59,235
2014	586,817	64,827
Total		1,466,582

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