Year	Number
1950	52.7
1951	52.95
1952	53.042
1953	53.237
1954	53.511
1955	53.772
1956	53.952
1957	54.231
1958	54.532
1959	54.771
1960	54.894
1961	54.743
1962	54.589
1963	54.379
1964	54.076
1965	53.683
1966	53.489
1967	52.961
1968	52.295
1969	51.754
1970	51.473
1971	51.529
1972	51.89
1973	52.415
1974	52.879
1975	53.166
1976	53.52
1977	53.704
1978	53.737
1979	53.606
1980	53.29
1981	52.618
1982	51.538
1983	50.207
1984	48.891
1985	47.769
1986	47.148
1987	46.811
1988	46.593
1989	46.262
1990	45.71
1991	45.586
1992	45.243
1993	44.763
1994	44.288
1995	43.911
1996	43.536
1997	43.294
1998	43.129
1999	42.94
2000	42.68
2001	42.517
2002	42.262
2003	41.998
2004	41.848
2005	41.88
2006	42.046
2007	42.43
2008	42.968
2009	43.544
2010	44.11
2011	44.987
2012	45.766
2013	46.545
2014	47.495
2015	48.705
2016	50.069
2017	51.703
2018	53.48
2019	55.212
2020	56.775
2021	58.119
2022	59.341
2023	60.44
2024	61.44
2025	62.359
2026	63.225
2027	63.994
2028	64.699
2029	65.406
2030	66.165
2031	66.897
2032	67.717
2033	68.602
2034	69.486
2035	70.331
2036	71.045
2037	71.744
2038	72.478
2039	73.354
2040	74.456
2041	75.646
2042	77.03
2043	78.595
2044	80.25
2045	81.889
2046	83.312
2047	84.744
2048	86.128
2049	87.411
2050	88.582
2051	89.489
2052	90.297
2053	90.965
2054	91.431
2055	91.649
2056	91.406
2057	90.96
2058	90.356
2059	89.658
2060	88.909
2061	87.913
2062	86.956
2063	86.017
2064	85.081
2065	84.169
2066	83.099
2067	82.094
2068	81.231
2069	80.575
2070	80.131
2071	79.669
2072	79.477
2073	79.501
2074	79.674
2075	79.973
2076	80.243
2077	80.68
2078	81.249
2079	81.884
2080	82.529
2081	82.976
2082	83.452
2083	83.926
2084	84.389
2085	84.845
2086	85.054
2087	85.255
2088	85.455
2089	85.653
2090	85.832
2091	85.692
2092	85.565
2093	85.45
2094	85.355
2095	85.296
2096	84.969
2097	84.701
2098	84.521
2099	84.454
2100	84.508