Year	years
1960	47.785
1961	48.529
1962	48.811
1963	49.753
1964	50.464
1965	51.114
1966	51.819
1967	52.565
1968	53.266
1969	53.795
1970	54.526
1971	55.121
1972	55.721
1973	56.285
1974	56.875
1975	57.467
1976	57.962
1977	58.488
1978	59.047
1979	59.528
1980	59.895
1981	60.414
1982	60.684
1983	60.985
1984	61.245
1985	61.557
1986	61.709
1987	61.968
1988	62.038
1989	62.256
1990	62.386
1991	62.47
1992	62.775
1993	62.956
1994	63.2
1995	63.439
1996	63.477
1997	63.656
1998	62.732
1999	63.828
2000	63.785
2001	63.852
2002	63.828
2003	63.932
2004	64.021
2005	63.937
2006	63.872
2007	63.861
2008	64.787
2009	65.096
2010	65.268
2011	66.121
2012	66.439
2013	66.761
2014	67.058
2015	67.818
2016	67.927
2017	68.078
2018	68.123
2019	68.671
2020	68.804
2021	68.415
2022	69.172