Year	years
1960	55.017
1961	55.831
1962	56.599
1963	57.31
1964	57.947
1965	58.499
1966	58.981
1967	59.42
1968	59.835
1969	60.25
1970	60.69
1971	61.155
1972	61.614
1973	62.055
1974	62.459
1975	62.81
1976	63.123
1977	63.434
1978	63.778
1979	64.189
1980	64.703
1981	65.313
1982	65.975
1983	66.644
1984	67.29
1985	67.874
1986	68.388
1987	68.844
1988	69.253
1989	69.623
1990	69.971
1991	70.298
1992	70.616
1993	70.942
1994	71.279
1995	71.646
1996	72.037
1997	72.445
1998	72.845
1999	73.225
2000	73.569
2001	73.867
2002	74.106
2003	74.274
2004	74.372
2005	74.376
2006	74.331
2007	74.238
2008	74.152
2009	74.119
2010	74.19
2011	74.365
2012	74.574
2013	74.739
2014	74.797
2015	74.682
2016	74.412
2017	74.138
2018	74.015
2019	74.202
2020	70.133
2021	70.213
2022	74.832