Year	years
1960	70.707
1961	70.502
1962	70.755
1963	71.911
1964	71.952
1965	71.249
1966	72.385
1967	73.154
1968	73.28
1969	73.953
1970	74.329
1971	74.059
1972	74.514
1973	74.742
1974	74.922
1975	75.092
1976	75.221
1977	75.279
1978	75.415
1979	75.633
1980	75.823
1981	76.07
1982	76.606
1983	76.208
1984	76.348
1985	76.158
1986	76.901
1987	77.017
1988	77.573
1989	77.573
1990	77.789
1991	79.109
1992	78.621
1993	78.811
1994	78.99
1995	79.179
1996	79.356
1997	79.533
1998	79.709
1999	79.884
2000	80.062
2001	80.247
2002	80.432
2003	80.606
2004	80.789
2005	80.961
2006	81.132
2007	81.302
2008	81.472
2009	81.64
2010	81.808
2011	83.25
2012	82.24
2013	82.044
2014	83.008
2015	82.613
2016	82.779
2017	81.55
2018	84.282
2019	83.26
2020	83.423
2021	83.624
2022	83.658