Year	Number
1950	68.779
1951	68.599
1952	68.83
1953	69.123
1954	68.967
1955	68.221
1956	68.14
1957	67.308
1958	66.265
1959	65.673
1960	65.871
1961	65.981
1962	67.445
1963	69.612
1964	71.494
1965	72.614
1966	74.818
1967	75.551
1968	75.529
1969	75.806
1970	76.8
1971	76.974
1972	78.076
1973	79.433
1974	79.943
1975	79.08
1976	77.732
1977	75.008
1978	71.477
1979	68.036
1980	65.128
1981	61.92
1982	59.551
1983	57.691
1984	55.862
1985	53.914
1986	52.463
1987	50.807
1988	49.19
1989	47.923
1990	47.098
1991	46.708
1992	46.477
1993	46.416
1994	46.469
1995	46.575
1996	46.376
1997	46.434
1998	46.566
1999	46.561
2000	46.338
2001	46.047
2002	45.51
2003	44.843
2004	44.244
2005	43.811
2006	43.453
2007	43.251
2008	43.174
2009	43.149
2010	43.144
2011	43.081
2012	43.059
2013	43.092
2014	43.208
2015	43.427
2016	43.756
2017	44.187
2018	44.687
2019	45.2
2020	45.694
2021	46.056
2022	46.407
2023	46.848
2024	47.533
2025	48.565
2026	49.905
2027	51.584
2028	53.528
2029	55.601
2030	57.705
2031	59.753
2032	61.809
2033	63.888
2034	66.032
2035	68.26
2036	70.425
2037	72.67
2038	74.856
2039	76.767
2040	78.266
2041	79.177
2042	79.648
2043	79.843
2044	79.994
2045	80.238
2046	80.327
2047	80.515
2048	80.807
2049	81.257
2050	81.943
2051	82.643
2052	83.577
2053	84.73
2054	85.948
2055	87.046
2056	87.715
2057	88.34
2058	88.867
2059	89.314
2060	89.766
2061	90.044
2062	90.328
2063	90.672
2064	91.078
2065	91.498
2066	91.694
2067	91.985
2068	92.276
2069	92.532
2070	92.813
2071	92.887
2072	92.922
2073	93.032
2074	93.305
2075	93.711
2076	93.795
2077	94.013
2078	94.342
2079	94.713
2080	95.068
2081	95.099
2082	95.227
2083	95.367
2084	95.482
2085	95.623
2086	95.512
2087	95.422
2088	95.411
2089	95.513
2090	95.699
2091	95.548
2092	95.496
2093	95.516
2094	95.59
2095	95.723
2096	95.531
2097	95.432
2098	95.443
2099	95.546
2100	95.701