Year	Number
1950	82.961
1951	81.173
1952	78.563
1953	75.478
1954	72.453
1955	69.803
1956	69.049
1957	68.113
1958	67.203
1959	66.377
1960	65.687
1961	66.634
1962	66.844
1963	66.689
1964	66.573
1965	66.723
1966	69.721
1967	72.246
1968	74.148
1969	74.954
1970	74.359
1971	79.511
1972	83.473
1973	86.499
1974	89.716
1975	94.373
1976	84.525
1977	78.096
1978	73.709
1979	70.16
1980	66.883
1981	67.956
1982	68.66
1983	69.079
1984	69.441
1985	69.835
1986	70.83
1987	71.303
1988	71.349
1989	71.014
1990	70.348
1991	70.012
1992	69.509
1993	68.707
1994	67.437
1995	65.693
1996	64.171
1997	62.107
1998	59.869
1999	57.915
2000	56.491
2001	54.411
2002	52.783
2003	51.44
2004	50.09
2005	48.573
2006	47.216
2007	45.725
2008	44.235
2009	42.92
2010	41.849
2011	41.326
2012	40.946
2013	40.673
2014	40.427
2015	40.169
2016	39.948
2017	39.728
2018	39.508
2019	39.299
2020	39.109
2021	39.011
2022	38.896
2023	38.783
2024	38.697
2025	38.649
2026	38.654
2027	38.679
2028	38.74
2029	38.839
2030	38.986
2031	39.201
2032	39.438
2033	39.713
2034	40.034
2035	40.409
2036	40.839
2037	41.293
2038	41.783
2039	42.311
2040	42.88
2041	43.492
2042	44.111
2043	44.741
2044	45.382
2045	46.03
2046	46.682
2047	47.312
2048	47.925
2049	48.519
2050	49.094
2051	49.666
2052	50.19
2053	50.681
2054	51.157
2055	51.629
2056	52.118
2057	52.584
2058	53.018
2059	53.404
2060	53.733
2061	54.032
2062	54.263
2063	54.462
2064	54.674
2065	54.929
2066	55.263
2067	55.62
2068	56.007
2069	56.422
2070	56.862
2071	57.366
2072	57.89
2073	58.433
2074	58.987
2075	59.546
2076	60.138
2077	60.727
2078	61.317
2079	61.909
2080	62.503
2081	63.093
2082	63.676
2083	64.257
2084	64.833
2085	65.398
2086	65.917
2087	66.431
2088	66.937
2089	67.431
2090	67.916
2091	68.332
2092	68.735
2093	69.139
2094	69.548
2095	69.964
2096	70.279
2097	70.61
2098	70.96
2099	71.321
2100	71.69