Year	Measure
1800	5
1820	5
1855	5
1873	4
1874	4
1875	4
1876	4
1877	4
1878	4
1879	4
1880	4
1881	4
1882	4
1883	4
1884	4
1885	4
1886	4
1887	4
1888	4
1889	4
1890	4
1891	4
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	1
1921	1
1922	1
1923	1
1924	1
1925	1
1926	1
1927	1
1928	1
1929	1
1930	1
1931	1
1932	1
1933	1
1934	1
1935	1
1936	1
1937	1
1938	1
1939	1
1940	1
1941	1
1942	1
1943	1
1944	1
1945	1
1946	1
1947	1
1948	1
1949	1
1950	2
1951	2
1952	2
1953	2
1954	2
1955	2
1956	2
1957	2
1958	2
1959	2
1960	2
1961	2
1962	2
1963	2
1964	2
1965	2
1966	2
1967	2
1968	2
1969	2
1970	2
1971	2
1972	2
1973	2
1974	2
1975	2
1976	2
1977	2
1978	2
1979	2
1980	2
1981	2
1982	2
1983	2
1984	2
1985	2
1986	2
1987	2
1988	2
1989	2
1990	2
1991	2
1992	2
1993	2
1994	2
1995	2
1996	2
1997	2
1998	2
1999	2
2000	2
2001	2
2002	2
2003	2
2004	2
2005	2
2006	2
2007	2
2008	2
2009	2