Year	years
1960	42.071
1961	42.18
1962	42.483
1963	42.704
1964	42.905
1965	43.148
1966	43.364
1967	43.575
1968	43.778
1969	43.975
1970	44.164
1971	44.353
1972	44.547
1973	44.738
1974	42.471
1975	42.832
1976	43.216
1977	45.529
1978	45.43
1979	45.92
1980	46.105
1981	46.283
1982	46.443
1983	46.782
1984	47.078
1985	46.922
1986	47.014
1987	47.525
1988	39.87
1989	43.209
1990	43.572
1991	24.904
1992	26.114
1993	49.196
1994	48.885
1995	49.092
1996	48.946
1997	48.779
1998	49.247
1999	49.093
2000	49.272
2001	49.339
2002	49.334
2003	49.147
2004	49.034
2005	49.176
2006	49.022
2007	48.88
2008	49.456
2009	50.298
2010	48.669
2011	49.625
2012	51.248
2013	51.97
2014	52.267
2015	52.855
2016	52.887
2017	53.577
2018	54.283
2019	55.122
2020	53.967
2021	53.246
2022	54.072