Year	years
1960	51.365
1961	52.618
1962	53.82
1963	55.071
1964	56.313
1965	57.358
1966	58.328
1967	59.409
1968	60.401
1969	61.426
1970	62.407
1971	63.222
1972	64.037
1973	64.866
1974	65.55
1975	66.121
1976	66.537
1977	66.964
1978	67.117
1979	67.384
1980	68.048
1981	68.194
1982	68.354
1983	68.551
1984	68.705
1985	68.84
1986	69.12
1987	69.476
1988	69.643
1989	69.853
1990	70.05
1991	70.321
1992	70.66
1993	70.957
1994	71.202
1995	71.428
1996	71.669
1997	70.773
1998	72.19
1999	72.401
2000	72.646
2001	72.921
2002	73.22
2003	73.499
2004	73.786
2005	74.033
2006	74.243
2007	75.1
2008	75.163
2009	75.316
2010	75.493
2011	75.693
2012	75.73
2013	75.786
2014	76.114
2015	76.404
2016	76.639
2017	76.873
2018	77.037
2019	77.168
2020	74.632
2021	74.087
2022	74.502