Year	Number
1822	-1
1823	-1
1824	-1
1825	-1
1826	-1
1827	-1
1828	-1
1829	-1
1830	-1
1831	-1
1832	-1
1833	-1
1834	-2
1835	-3
1836	-3
1837	-3
1838	-3
1839	-3
1840	-3
1841	-3
1842	-3
1843	-3
1844	-3
1845	-3
1846	-3
1847	-3
1848	-3
1849	-3
1850	-3
1851	-3
1852	-3
1853	-3
1854	-3
1855	-3
1856	-3
1857	-3
1858	-3
1859	-3
1860	-3
1861	-3
1862	-3
1863	-3
1864	-3
1865	-3
1866	-3
1867	-5
1868	-5
1869	-5
1870	-5
1871	-5
1872	-5
1873	-5
1874	-5
1875	-5
1876	-6
1877	-7
1878	-8
1879	-9
1880	-9
1881	-9
1882	-9
1883	-9
1884	-9
1885	-9
1886	-9
1887	-9
1888	-9
1889	-9
1890	-9
1891	-9
1892	-9
1893	-9
1894	-9
1895	-9
1896	-9
1897	-9
1898	-9
1899	-9
1900	-9
1901	-9
1902	-9
1903	-9
1904	-9
1905	-9
1906	-9
1907	-9
1908	-9
1909	-9
1910	-9
1911	0
1912	0
1913	0
1914	0
1915	0
1916	0
1917	-1
1918	-1
1919	-1
1920	-1
1921	-1
1922	-1
1923	-1
1924	-3
1925	-3
1926	-3
1927	-3
1928	-3
1929	-3
1930	-6
1931	-6
1932	-6
1933	-6
1934	-6
1935	-6
1936	-6
1937	-6
1938	-6
1939	-6
1940	-6
1941	-6
1942	-6
1943	-6
1944	-6
1945	-6
1946	-6
1947	-6
1948	-6
1949	-6
1950	-6
1951	-6
1952	-6
1953	-6
1954	-6
1955	-6
1956	-6
1957	-6
1958	-6
1959	-6
1960	-6
1961	-6
1962	-6
1963	-6
1964	-6
1965	-6
1966	-6
1967	-6
1968	-6
1969	-6
1970	-6
1971	-6
1972	-6
1973	-6
1974	-6
1975	-6
1976	-6
1977	-3
1978	-3
1979	-3
1980	-3
1981	-3
1982	-3
1983	-3
1984	-3
1985	-3
1986	-3
1987	-3
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	4
1995	4
1996	4
1997	6
1998	6
1999	6
2000	8
2001	8
2002	8
2003	8
2004	8
2005	8
2006	8
2007	8
2008	8
2009	8
2010	8
2011	8