Year	years
1960	48.14
1961	48.768
1962	49.354
1963	49.992
1964	50.692
1965	51.317
1966	51.929
1967	52.513
1968	53.069
1969	53.628
1970	54.18
1971	54.664
1972	55.227
1973	55.739
1974	56.259
1975	56.733
1976	57.303
1977	57.827
1978	58.476
1979	58.86
1980	59.201
1981	59.644
1982	59.804
1983	60.276
1984	60.528
1985	60.975
1986	61.204
1987	61.5
1988	61.481
1989	61.712
1990	61.645
1991	61.682
1992	61.627
1993	61.88
1994	61.773
1995	61.783
1996	61.67
1997	61.725
1998	61.696
1999	61.81
2000	62.24
2001	62.356
2002	62.397
2003	62.982
2004	63.05
2005	63.215
2006	63.765
2007	64.079
2008	64.768
2009	65.12
2010	65.843
2011	66.094
2012	66.759
2013	67.007
2014	67.248
2015	67.826
2016	68.003
2017	68.736
2018	68.789
2019	68.865
2020	69.116
2021	68.494
2022	68.359