Year	years
1960	64.187
1961	64.804
1962	65.424
1963	62.282
1964	62.79
1965	67.052
1966	67.495
1967	67.917
1968	68.273
1969	68.49
1970	68.927
1971	69.33
1972	69.811
1973	70.163
1974	55.23
1975	70.518
1976	71.04
1977	71.302
1978	71.767
1979	71.895
1980	71.95
1981	71.941
1982	71.981
1983	72.311
1984	72.255
1985	72.647
1986	72.651
1987	73.089
1988	73.129
1989	73.48
1990	73.539
1991	73.716
1992	74.177
1993	74.65
1994	74.72
1995	75.133
1996	75.522
1997	75.841
1998	76.182
1999	76.295
2000	76.568
2001	76.989
2002	77.487
2003	77.788
2004	77.944
2005	78.101
2006	78.371
2007	78.81
2008	78.981
2009	79.401
2010	79.665
2011	79.999
2012	80.109
2013	80.402
2014	80.771
2015	80.966
2016	81.056
2017	81.328
2018	81.382
2019	81.397
2020	81.391
2021	81.203
2022	81.889