Year	Years
1800	469.8
1906	682.1
1907	490.4
1908	518
1909	409.3
1910	435.2
1911	427.1
1912	675.6
1913	394.8
1914	654.5
1915	313.9
1916	393.2
1917	469.3
1918	333.4
1919	571.6
1920	438.5
1921	651.2
1922	304.1
1923	597.6
1924	483.9
1925	506.7
1926	509.9
1927	326.9
1928	537.5
1929	388.4
1930	375.4
1931	483.9
1932	322
1933	381.9
1934	415.7
1935	357.7
1936	322
1937	352.8
1938	359.3
1939	315.5
1940	292.6
1941	364.1
1942	284.4
1943	266.8
1944	277.8
1945	240.7
1946	260.2
1947	270.1
1948	249.7
1949	203.5
1950	196
1951	216.6
1952	233.3
1953	222.2
1954	167.6
1955	145.1
1956	126.4
1957	111.4
1958	99.7
1959	90.7
1960	83.7
1961	77.9
1962	73
1963	68.6
1964	64.7
1965	61.2
1966	58.2
1967	55.5
1968	53
1969	50.5
1970	48.1
1971	45.7
1972	43.3
1973	41
1974	38.8
1975	36.7
1976	34.6
1977	32.6
1978	30.7
1979	28.9
1980	27.3
1981	25.9
1982	24.6
1983	23.6
1984	22.7
1985	21.9
1986	21.1
1987	20.4
1988	19.6
1989	18.8
1990	18.1
1991	17.4
1992	16.8
1993	16.3
1994	16
1995	15.8
1996	15.8
1997	15.9
1998	16
1999	16.2
2000	16.4
2001	16.5
2002	16.6
2003	16.5
2004	16.2
2005	16
2006	15.7
2007	15.4
2008	15.1
2009	15
2010	14.8
2011	14.7
2012	14.6
2013	14.4