Year	Number
1818	-5
1819	-5
1820	-5
1821	-5
1822	-5
1823	-5
1824	-5
1825	-5
1826	-5
1827	-5
1828	-5
1829	-5
1830	-5
1831	-5
1832	-5
1833	-5
1834	-5
1835	-5
1836	-5
1837	-5
1838	-5
1839	-5
1840	-5
1841	-5
1842	-5
1843	-5
1844	-5
1845	-5
1846	-5
1847	-5
1848	-5
1849	-5
1850	-5
1851	0
1852	0
1853	0
1854	0
1855	0
1856	0
1857	0
1858	0
1859	0
1860	0
1861	0
1862	0
1863	0
1864	0
1865	0
1866	0
1867	0
1868	0
1869	0
1870	0
1871	0
1872	0
1873	0
1874	3
1875	3
1876	3
1877	3
1878	3
1879	3
1880	3
1881	3
1882	3
1883	3
1884	3
1885	3
1886	3
1887	3
1888	5
1889	5
1890	5
1891	3
1892	3
1893	3
1894	3
1895	3
1896	3
1897	3
1898	3
1899	3
1900	3
1901	3
1902	3
1903	3
1904	3
1905	3
1906	3
1907	3
1908	3
1909	3
1910	3
1911	3
1912	3
1913	3
1914	3
1915	3
1916	3
1917	3
1918	3
1919	3
1920	3
1921	3
1922	3
1923	3
1924	0
1925	-2
1926	-2
1927	-2
1928	-2
1929	-2
1930	-2
1931	-2
1932	-2
1933	-2
1934	-2
1935	2
1936	2
1937	2
1938	2
1939	2
1940	2
1941	2
1942	2
1943	2
1944	2
1945	2
1946	2
1947	2
1948	2
1949	2
1950	2
1951	2
1952	2
1953	2
1954	2
1955	5
1956	5
1957	5
1958	5
1959	5
1960	5
1961	5
1962	5
1963	5
1964	6
1965	6
1966	6
1967	6
1968	6
1969	6
1970	6
1971	6
1972	6
1973	-7
1974	-7
1975	-7
1976	-7
1977	-7
1978	-7
1979	-7
1980	-7
1981	-7
1982	-7
1983	-6
1984	-6
1985	-6
1986	-6
1987	-6
1988	-1
1989	8
1990	8
1991	8
1992	8
1993	8
1994	8
1995	8
1996	8
1997	8
1998	8
1999	8
2000	9
2001	9
2002	9
2003	9
2004	9
2005	9
2006	10
2007	10
2008	10
2009	10
2010	10
2011	10