Year	Number
1950	64.54
1951	63.891
1952	62.217
1953	61.047
1954	61.136
1955	62.57
1956	64.938
1957	68.568
1958	72.985
1959	77.549
1960	81.869
1961	86.659
1962	90.852
1963	94.429
1964	97.421
1965	99.734
1966	101.426
1967	102.199
1968	102.044
1969	101.009
1970	99.204
1971	96.529
1972	93.654
1973	90.608
1974	87.355
1975	83.88
1976	80.203
1977	76.442
1978	72.744
1979	69.319
1980	66.298
1981	64.387
1982	62.786
1983	61.531
1984	60.646
1985	60.138
1986	60.425
1987	60.827
1988	61.284
1989	61.758
1990	62.22
1991	62.567
1992	62.927
1993	63.199
1994	63.241
1995	62.942
1996	62.548
1997	61.813
1998	60.745
1999	59.416
2000	57.903
2001	56.006
2002	54.096
2003	52.138
2004	50.096
2005	47.999
2006	46.114
2007	44.235
2008	42.518
2009	41.148
2010	40.17
2011	39.201
2012	38.658
2013	38.349
2014	38.119
2015	38.016
2016	39.532
2017	40.745
2018	41.874
2019	43.156
2020	44.612
2021	45.437
2022	46.599
2023	47.86
2024	48.883
2025	49.533
2026	50.132
2027	50.401
2028	50.364
2029	50.149
2030	49.848
2031	49.528
2032	49.101
2033	48.674
2034	48.337
2035	48.141
2036	48.18
2037	48.337
2038	48.58
2039	48.843
2040	49.086
2041	49.369
2042	49.593
2043	49.838
2044	50.201
2045	50.728
2046	51.456
2047	52.302
2048	53.234
2049	54.167
2050	55.06
2051	56.043
2052	56.967
2053	57.836
2054	58.655
2055	59.411
2056	60.205
2057	60.924
2058	61.524
2059	61.943
2060	62.155
2061	62.271
2062	62.183
2063	61.932
2064	61.566
2065	61.109
2066	60.648
2067	60.125
2068	59.548
2069	58.926
2070	58.282
2071	57.735
2072	57.137
2073	56.622
2074	56.372
2075	56.479
2076	57.047
2077	57.958
2078	59.079
2079	60.197
2080	61.172
2081	62.186
2082	63.082
2083	63.853
2084	64.497
2085	65.004
2086	65.473
2087	65.808
2088	66.021
2089	66.138
2090	66.185
2091	66.202
2092	66.16
2093	66.092
2094	66.044
2095	66.046
2096	66.066
2097	66.136
2098	66.26
2099	66.441
2100	66.683