Year Number
1800 -10
1801 -10
1802 -10
1803 -10
1804 -10
1805 -10
1806 -10
1807 -10
1808 -10
1809 -10
1810 -10
1811 -10
1812 -10
1813 -10
1814 -10
1815 -10
1816 -10
1817 -10
1818 -10
1819 -10
1820 -10
1821 -10
1822 -10
1823 -10
1824 -10
1825 -10
1826 -10
1827 -10
1828 -10
1829 -10
1830 -10
1831 -10
1832 -10
1833 -10
1834 -10
1835 -10
1836 -10
1837 -10
1838 -10
1839 -10
1840 -10
1841 -10
1842 -10
1843 -10
1844 -10
1845 -10
1846 -10
1847 -10
1848 -10
1849 -10
1850 -10
1851 -10
1852 -10
1853 -10
1854 -10
1855 -10
1856 -10
1857 -10
1858 -10
1859 -10
1860 -10
1861 -10
1862 -10
1863 -10
1864 -10
1865 -10
1866 -10
1867 -10
1868 -10
1869 -10
1870 -10
1871 -10
1872 -10
1873 -10
1874 -10
1875 -10
1876 -4
1877 -10
1878 -10
1879 -10
1880 -10
1881 -10
1882 -10
1883 -10
1884 -10
1885 -10
1886 -10
1887 -10
1888 -10
1889 -10
1890 -10
1891 -10
1892 -10
1893 -10
1894 -10
1895 -10
1896 -10
1897 -10
1898 -10
1899 -10
1900 -10
1901 -10
1902 -10
1903 -10
1904 -10
1905 -10
1906 -10
1907 -10
1908 -4
1909 -1
1910 -1
1911 -1
1912 -1
1913 -1
1914 -1
1915 -1
1916 -1
1917 -1
1918 -1
1919 -1
1920 -1
1921 -1
1922 0
1923 -6
1924 -6
1925 -6
1926 -6
1927 -6
1928 -6
1929 -6
1930 -6
1931 -6
1932 -6
1933 -6
1934 -7
1935 -7
1936 -7
1937 -7
1938 -7
1939 -7
1940 -7
1941 -7
1942 -7
1943 -7
1944 -7
1945 -7
1946 7
1947 7
1948 7
1949 7
1950 7
1951 7
1952 7
1953 7
1954 4
1955 4
1956 4
1957 4
1958 4
1959 4
1960 7
1961 9
1962 9
1963 9
1964 9
1965 8
1966 8
1967 8
1968 8
1969 8
1970 8
1971 -2
1972 -2
1973 9
1974 9
1975 9
1976 9
1977 9
1978 9
1979 9
1980 -5
1981 -5
1982 -5
1983 7
1984 7
1985 7
1986 7
1987 7
1988 7
1989 9
1990 9
1991 9
1992 9
1993 8
1994 8
1995 8
1996 8
1997 7
1998 7
1999 7
2000 7
2001 7
2002 7
2003 7
2004 7
2005 7
2006 7
2007 7
2008 7
2009 7
2010 7
2011 9