Year	years
1960	51.261
1961	51.681
1962	51.89
1963	52.196
1964	52.464
1965	52.779
1966	52.919
1967	53.242
1968	53.666
1969	54.023
1970	54.364
1971	54.791
1972	55.216
1973	55.721
1974	56.22
1975	56.697
1976	56.977
1977	57.153
1978	57.324
1979	57.271
1980	57.231
1981	57.129
1982	57.367
1983	57.394
1984	57.612
1985	57.947
1986	58.535
1987	58.996
1988	59.173
1989	59.337
1990	59.183
1991	58.572
1992	49.109
1993	45.771
1994	53.142
1995	56.115
1996	56.012
1997	57.446
1998	58.684
1999	60.095
2000	60.697
2001	61.823
2002	62.566
2003	63.318
2004	63.685
2005	64.202
2006	64.676
2007	64.926
2008	65.455
2009	65.776
2010	65.365
2011	65.728
2012	66.247
2013	66.662
2014	66.751
2015	66.996
2016	67.254
2017	67.682
2018	68.272
2019	68.862
2020	65.999
2021	69.568
2022	69.189