Year	years
1960	45.729
1961	46.154
1962	46.41
1963	44.15
1964	47.719
1965	44.933
1966	42.402
1967	42.834
1968	43.224
1969	42.734
1970	43.12
1971	47.327
1972	47.827
1973	51.596
1974	51.74
1975	51.922
1976	51.959
1977	52.188
1978	52.212
1979	52.301
1980	52.374
1981	52.454
1982	52.768
1983	45.25
1984	43.584
1985	43.79
1986	48.474
1987	38.868
1988	30.824
1989	45.571
1990	45.948
1991	46.468
1992	41.385
1993	42.111
1994	54.381
1995	48.362
1996	48.6
1997	49.132
1998	44.261
1999	54.209
2000	55.623
2001	55.768
2002	56.223
2003	55.186
2004	53.371
2005	53.911
2006	57.729
2007	58.652
2008	58.629
2009	60.127
2010	60.654
2011	60.819
2012	61.266
2013	60.917
2014	61.461
2015	62.081
2016	62.23
2017	62.957
2018	63.208
2019	63.432
2020	63.106
2021	62.741
2022	63.048