Year	years
1960	50.264
1961	50.84
1962	51.411
1963	51.799
1964	52.542
1965	50.864
1966	53.666
1967	54.289
1968	54.894
1969	55.513
1970	56.145
1971	56.782
1972	57.417
1973	58.042
1974	58.65
1975	59.236
1976	59.791
1977	60.319
1978	60.822
1979	60.753
1980	61.754
1981	62.194
1982	62.648
1983	63.109
1984	63.602
1985	64.139
1986	64.727
1987	65.339
1988	65.951
1989	66.546
1990	67.11
1991	67.625
1992	68.084
1993	68.472
1994	68.792
1995	68.988
1996	69.097
1997	69.166
1998	69.096
1999	69.279
2000	69.423
2001	69.642
2002	69.923
2003	70.265
2004	70.331
2005	70.875
2006	71.165
2007	71.371
2008	71.658
2009	71.871
2010	72.093
2011	72.221
2012	72.514
2013	72.713
2014	72.867
2015	72.953
2016	72.987
2017	73.063
2018	73.232
2019	73.577
2020	72.889
2021	72.615
2022	74.17