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