Year	years
1960	45.544
1961	46.225
1962	46.993
1963	47.596
1964	48.16
1965	48.621
1966	49.174
1967	49.565
1968	50.047
1969	50.495
1970	50.956
1971	51.322
1972	51.643
1973	51.919
1974	52.275
1975	52.605
1976	52.798
1977	53.054
1978	53.186
1979	53.49
1980	53.66
1981	53.953
1982	54.012
1983	54.284
1984	54.58
1985	54.644
1986	54.63
1987	54.686
1988	54.52
1989	54.36
1990	54.147
1991	53.767
1992	53.775
1993	53.358
1994	53.059
1995	53.012
1996	52.795
1997	42.922
1998	49.012
1999	51.712
2000	52.932
2001	53.752
2002	54.388
2003	55.284
2004	56.34
2005	57.452
2006	58.194
2007	58.848
2008	59.6
2009	60.135
2010	60.57
2011	60.833
2012	61.288
2013	61.388
2014	61.656
2015	62.137
2016	62.185
2017	62.392
2018	62.834
2019	61.346
2020	62.212
2021	62.124
2022	61.513