Year	years
1960	57.902
1961	58.842
1962	59.769
1963	60.646
1964	61.513
1965	62.501
1966	62.847
1967	63.231
1968	63.69
1969	64.127
1970	64.594
1971	65.077
1972	65.601
1973	66.149
1974	66.775
1975	67.311
1976	67.874
1977	68.805
1978	69.291
1979	69.763
1980	70.323
1981	71.003
1982	71.383
1983	71.741
1984	72.14
1985	72.447
1986	72.706
1987	72.924
1988	73.17
1989	73.383
1990	73.525
1991	73.671
1992	73.875
1993	74.092
1994	74.442
1995	74.692
1996	74.65
1997	74.64
1998	74.542
1999	74.664
2000	75.11
2001	75.66
2002	75.857
2003	76.194
2004	76.276
2005	76.437
2006	76.432
2007	76.474
2008	76.576
2009	76.79
2010	77.124
2011	77.485
2012	77.598
2013	77.618
2014	77.677
2015	77.728
2016	77.938
2017	78.139
2018	78.267
2019	78.306
2020	78.472
2021	77.362
2022	78.799