Year	years
1960	47.24
1961	48.249
1962	49.2
1963	50.078
1964	50.838
1965	51.518
1966	52.04
1967	52.769
1968	53.337
1969	53.991
1970	54.746
1971	55.386
1972	55.964
1973	56.579
1974	57.152
1975	57.583
1976	57.515
1977	57.664
1978	57.782
1979	57.856
1980	57.982
1981	58.069
1982	58.214
1983	58.72
1984	59.212
1985	59.521
1986	59.521
1987	60.047
1988	60.549
1989	61.054
1990	61.509
1991	62.004
1992	62.442
1993	62.847
1994	63.224
1995	63.214
1996	63.126
1997	63.665
1998	64.492
1999	65.189
2000	65.86
2001	67.189
2002	68.112
2003	69.344
2004	69.929
2005	70.15
2006	70.436
2007	70.796
2008	71.103
2009	71.472
2010	71.843
2011	71.694
2012	72.46
2013	72.884
2014	73.283
2015	73.684
2016	74.048
2017	74.293
2018	75.829
2019	76.645
2020	77.02
2021	75.696
2022	77.375