Year	Number
1879	-4
1880	-4
1881	-6
1882	-6
1883	-1
1884	-1
1885	-1
1886	-5
1887	-5
1888	-5
1889	-5
1890	-5
1891	-5
1892	-5
1893	-5
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	-9
1912	-9
1913	-9
1914	-9
1915	-9
1916	-9
1917	-9
1918	2
1919	-3
1920	-3
1921	-3
1922	-3
1923	-3
1924	-3
1925	-3
1926	-3
1927	-3
1928	-3
1929	-3
1930	-3
1931	-3
1932	-3
1933	-3
1934	-7
1935	-10
1936	-10
1937	-10
1938	-10
1939	-10
1940	-10
1941	-10
1942	-10
1943	0
1944	-2
1945	-4
1946	-6
1947	-7
1948	-7
1949	-7
1950	-7
1951	-7
1952	-7
1953	-7
1954	-7
1955	-7
1956	-7
1957	-7
1958	-7
1959	-7
1960	-7
1961	-7
1962	-7
1963	-7
1964	-7
1965	-7
1966	-7
1967	-7
1968	-7
1969	-7
1970	-7
1971	-7
1972	-7
1973	-7
1974	-7
1975	-7
1976	-7
1977	-7
1978	-7
1979	-7
1980	-7
1981	-7
1982	-7
1983	-7
1984	-7
1985	-7
1986	-7
1987	-7
1988	-7
1989	-7
1990	8
1991	8
1992	8
1993	8
1994	8
1995	8
1996	8
1997	8
1998	8
1999	8
2000	8
2001	9
2002	9
2003	9
2004	9
2005	9
2006	9
2007	9
2008	9
2009	9
2010	9
2011	9