Year	years
1960	43.04
1961	44.359
1962	45.861
1963	46.094
1964	47.161
1965	49.022
1966	51.56
1967	54.066
1968	54.916
1969	55.08
1970	56.516
1971	56.841
1972	57.349
1973	57.941
1974	58.042
1975	58.263
1976	58.576
1977	58.83
1978	59.325
1979	59.714
1980	59.739
1981	59.487
1982	59.558
1983	59.432
1984	59.487
1985	59.811
1986	57.527
1987	61.017
1988	61.334
1989	60.158
1990	61.471
1991	61.429
1992	61.284
1993	61.138
1994	61.069
1995	61.056
1996	61.097
1997	61.181
1998	61.187
1999	61.393
2000	61.655
2001	62.032
2002	62.6
2003	63.166
2004	63.731
2005	63.709
2006	64.398
2007	64.724
2008	65.079
2009	65.116
2010	65.249
2011	64.902
2012	65.746
2013	66.328
2014	66.845
2015	67.249
2016	67.492
2017	68.267
2018	68.355
2019	68.523
2020	67.785
2021	67.591
2022	68.794