Year	years
1960	64.78
1961	64.884
1962	64.965
1963	65.035
1964	65.109
1965	65.2
1966	65.307
1967	65.41
1968	65.52
1969	65.601
1970	65.65
1971	65.672
1972	65.52
1973	65.704
1974	65.757
1975	65.86
1976	66.015
1977	66.212
1978	66.442
1979	66.702
1980	66.986
1981	67.285
1982	67.585
1983	67.874
1984	68.147
1985	68.397
1986	68.623
1987	68.822
1988	68.991
1989	69.131
1990	69.242
1991	69.33
1992	69.405
1993	69.479
1994	69.561
1995	69.661
1996	69.787
1997	69.938
1998	70.118
1999	70.329
2000	70.575
2001	70.85
2002	71.135
2003	71.419
2004	71.683
2005	71.91
2006	72.109
2007	72.271
2008	72.412
2009	72.534
2010	72.649
2011	72.764
2012	72.888
2013	73.029
2014	73.196
2015	73.392
2016	73.586
2017	73.732
2018	73.753
2019	73.579
2020	74.688
2021	71.654
2022	74.147