Year	years
1960	71.599
1961	72.131
1962	72.26
1963	72.586
1964	72.919
1965	73.329
1966	73.618
1967	73.845
1968	73.855
1969	74.348
1970	74.556
1971	74.883
1972	75.321
1973	75.803
1974	75.833
1975	75.927
1976	76.247
1977	76.544
1978	76.907
1979	77.158
1980	77.38
1981	77.441
1982	77.548
1983	77.513
1984	77.556
1985	77.19
1986	77.858
1987	78.182
1988	78.209
1989	78.218
1990	78.244
1991	78.266
1992	78.277
1993	78.893
1994	78.869
1995	78.991
1996	79.107
1997	79.308
1998	79.475
1999	79.761
2000	80.126
2001	80.568
2002	80.807
2003	80.934
2004	81.236
2005	81.354
2006	81.475
2007	81.737
2008	81.927
2009	81.951
2010	82.06
2011	82.323
2012	82.428
2013	82.7
2014	82.882
2015	83.762
2016	84.464
2017	83.145
2018	84.236
2019	83.456
2020	82.588
2021	84.522
2022	83.897