Year	Total
1925	4.382
1926	4.39
1927	4.398
1928	4.406
1929	4.414
1930	4.422
1931	4.363
1932	4.304
1933	4.245
1934	4.186
1935	4.127
1936	3.932
1937	3.736
1938	3.54
1939	3.345
1940	3.149
1941	3.321
1942	3.492
1943	3.664
1944	3.835
1945	4.007
1946	4.11
1947	4.213
1948	4.316
1949	4.42
1950	4.523
1951	4.453
1952	4.322
1953	4.207
1954	4.109
1955	4.028
1956	3.964
1957	3.915
1958	3.88
1959	3.857
1960	3.843
1961	3.835
1962	3.83
1963	3.824
1964	3.817
1965	3.81
1966	3.804
1967	3.803
1968	3.806
1969	3.812
1970	3.817
1971	3.813
1972	3.798
1973	3.767
1974	3.722
1975	3.662
1976	3.59
1977	3.511
1978	3.43
1979	3.351
1980	3.28
1981	3.219
1982	3.17
1983	3.133
1984	3.106
1985	3.087
1986	3.072
1987	3.057
1988	3.04
1989	3.019
1990	2.996
1991	2.973
1992	2.952
1993	2.937
1994	2.928
1995	2.924
1996	2.924
1997	2.925
1998	2.925
1999	2.924
2000	2.921
2001	2.918
2002	2.914
2003	2.912
2004	2.91
2005	2.91
2006	2.911
2007	2.913
2008	2.916
2009	2.919
2010	2.92
2011	2.917
2012	2.91
2013	2.898
2014	2.882
2015	2.861
2016	2.838
2017	2.813
2018	2.788
2019	2.763
2020	2.74
2021	2.718
2022	2.698
2023	2.677
2024	2.657
2030	2.54
2040	2.37
2050	2.221
2070	2.023
2080	1.97
2099	1.917