Year	years
1960	43.555
1961	44.274
1962	45.072
1963	45.88
1964	46.658
1965	47.33
1966	47.608
1967	47.438
1968	47.939
1969	47.679
1970	47.897
1971	48.361
1972	48.743
1973	48.54
1974	49.752
1975	50.437
1976	51.157
1977	51.953
1978	52.864
1979	53.698
1980	54.586
1981	55.273
1982	55.995
1983	56.885
1984	57.83
1985	58.63
1986	59.358
1987	60.27
1988	60.984
1989	61.831
1990	62.227
1991	62.912
1992	63.228
1993	63.714
1994	63.876
1995	64.263
1996	64.68
1997	65.104
1998	65.528
1999	65.81
2000	65.897
2001	66.168
2002	66.383
2003	66.159
2004	66.336
2005	66.38
2006	66.525
2007	66.623
2008	66.785
2009	66.951
2010	67.096
2011	67.253
2012	67.513
2013	67.398
2014	67.773
2015	67.967
2016	68.233
2017	68.712
2018	68.875
2019	69.049
2020	68.667
2021	67.935
2022	67.869