Year	years
1960	50.74
1961	51.55
1962	52.382
1963	53.173
1964	53.714
1965	54.258
1966	54.71
1967	55.361
1968	55.835
1969	56.378
1970	56.895
1971	57.409
1972	58.069
1973	58.521
1974	59.051
1975	59.497
1976	59.965
1977	60.743
1978	61.37
1979	61.912
1980	62.504
1981	63.01
1982	63.604
1983	64.146
1984	64.706
1985	65.24
1986	65.772
1987	66.278
1988	66.794
1989	67.245
1990	67.709
1991	68.169
1992	68.486
1993	68.911
1994	69.295
1995	69.609
1996	70.141
1997	70.57
1998	71.039
1999	70.695
2000	71.861
2001	72.231
2002	72.579
2003	72.89
2004	73.24
2005	73.534
2006	73.845
2007	74.193
2008	74.45
2009	74.765
2010	75.069
2011	74.941
2012	75.678
2013	76.297
2014	76.565
2015	76.646
2016	76.66
2017	77.141
2018	77.563
2019	77.832
2020	75.85
2021	76.032
2022	78.475