Year	years
1960	54.596
1961	54.938
1962	55.105
1963	55.432
1964	55.779
1965	56.31
1966	56.49
1967	56.75
1968	57.158
1969	57.512
1970	57.794
1971	58.151
1972	58.417
1973	58.621
1974	58.831
1975	59.067
1976	59.203
1977	58.985
1978	59.215
1979	59.293
1980	59.799
1981	60.089
1982	60.407
1983	60.673
1984	60.855
1985	61.144
1986	61.654
1987	61.889
1988	62.056
1989	62.198
1990	62.344
1991	62.132
1992	62.169
1993	61.929
1994	61.769
1995	61.639
1996	61.702
1997	61.722
1998	62.014
1999	62.373
2000	62.727
2001	63.086
2002	63.636
2003	64.043
2004	64.302
2005	64.695
2006	65.202
2007	65.559
2008	66.086
2009	66.18
2010	66.655
2011	67.067
2012	67.277
2013	67.174
2014	67.379
2015	67.657
2016	68.016
2017	68.257
2018	68.479
2019	68.782
2020	67.876
2021	68.334
2022	69.032