Year	years
1960	59.414
1961	59.995
1962	60.521
1963	60.129
1964	61.518
1965	62.031
1966	62.498
1967	63.59
1968	64.419
1969	64.761
1970	65.223
1971	65.637
1972	65.722
1973	67.334
1974	67.644
1975	69.238
1976	68.678
1977	70.433
1978	71.28
1979	71.236
1980	71.913
1981	72.936
1982	73.575
1983	73.598
1984	74.215
1985	74.453
1986	74.918
1987	75.288
1988	75.456
1989	75.749
1990	75.96
1991	76.794
1992	77.068
1993	77.21
1994	77.704
1995	77.812
1996	78.196
1997	78.86
1998	78.72
1999	79.09
2000	79.977
2001	79.921
2002	80.582
2003	80.433
2004	80.72
2005	81.078
2006	80.917
2007	80.549
2008	81.25
2009	81.481
2010	81.213
2011	81.684
2012	81.596
2013	82.034
2014	82.145
2015	82.384
2016	82.57
2017	82.601
2018	82.527
2019	82.711
2020	82.041
2021	81.437
2022	81.877