units-by-year-sum

1848 2
1849 0
1850 2
1851 0
1853 1
1860 0
1863 10
1865 6
1868 4
1869 1
1870 27
1871 3
1872 1
1873 8
1874 7
1875 101
1876 12
1877 2
1878 59
1879 12
1880 334
1881 6
1882 6
1883 15
1884 13
1885 520
1886 23
1887 31
1888 25
1889 28
1890 1164
1891 19
1892 59
1893 26
1894 10
1895 552
1896 82
1897 23
1898 144
1899 28
1900 26099
1901 218
1902 1146
1903 638
1904 3784
1905 3127
1906 8444
1907 16265
1908 10878
1909 6245
1910 7647
1911 6645
1912 7261
1913 5398
1914 4792
1915 3840
1916 3922
1917 2051
1918 843
1919 1897
1920 1973
1921 2409
1922 5871
1923 8447
1924 8817
1925 10043
1926 8751
1927 9384
1928 6413
1929 3946
1930 2641
1931 2713
1932 1494
1933 713
1934 291
1935 827
1936 1969
1937 2045
1938 2426
1939 3168
1940 4775
1941 4380
1942 3429
1943 1107
1944 1467
1945 1603
1946 2371
1947 3321
1948 3346
1949 2671
1950 3264
1951 3321
1952 1233
1953 1231
1954 1516
1955 1944
1956 1598
1957 1309
1958 1810
1959 2229
1960 2535
1961 3160
1962 2784
1963 3995
1964 4231
1965 3496
1966 1610
1967 1080
1968 1829
1969 1126
1970 1024
1971 1286
1972 1951
1973 2531
1974 2257
1975 2534
1976 1200
1977 1288
1978 2035
1979 1214
1980 1279
1981 988
1982 1288
1983 1684
1984 816
1985 380
1986 1280
1987 2058
1988 1328
1989 2032
1990 1877
1991 1123
1992 1070
1993 1680
1994 688
1995 758
1996 998
1997 1307
1998 1139
1999 1091
2000 2068
2001 2195
2002 1826
2003 1196
2004 1730
2005 914
2006 1441
2007 2753
2008 2931
2009 1781
2010 513
2011 374
2012 272
2013 261
2014 1204
2015 150