Year	years
1960	43.293
1961	43.583
1962	43.807
1963	44.099
1964	44.315
1965	44.627
1966	44.86
1967	45.136
1968	45.343
1969	32.962
1970	33.119
1971	38.768
1972	45.012
1973	45.247
1974	42.358
1975	38.438
1976	31.92
1977	42.734
1978	43.042
1979	45.205
1980	49.142
1981	49.677
1982	50.172
1983	50.575
1984	50.704
1985	51.271
1986	51.646
1987	51.837
1988	52.123
1989	52.309
1990	52.417
1991	52.516
1992	52.698
1993	52.872
1994	52.956
1995	53.178
1996	53.331
1997	53.675
1998	53.948
1999	54.414
2000	54.936
2001	55.27
2002	55.731
2003	56.188
2004	56.638
2005	57.078
2006	57.683
2007	58.205
2008	58.772
2009	59.101
2010	59.583
2011	60.172
2012	60.647
2013	60.986
2014	61.452
2015	62.054
2016	62.332
2017	62.832
2018	63.042
2019	63.54
2020	62.943
2021	62.726
2022	63.261