Year	years
1960	41.299
1961	41.747
1962	42.134
1963	41.049
1964	42.932
1965	43.329
1966	43.622
1967	44.171
1968	44.589
1969	45.034
1970	45.5
1971	45.869
1972	46.151
1973	46.441
1974	46.715
1975	46.992
1976	47.353
1977	47.624
1978	47.862
1979	48.22
1980	48.621
1981	48.994
1982	49.316
1983	49.692
1984	50.009
1985	50.272
1986	50.515
1987	50.97
1988	51.365
1989	51.489
1990	51.827
1991	51.966
1992	52.489
1993	53.002
1994	53.37
1995	54.133
1996	54.647
1997	55.023
1998	55.562
1999	56.272
2000	56.608
2001	56.713
2002	57.019
2003	57.57
2004	56.715
2005	58.265
2006	58.521
2007	58.842
2008	59.029
2009	59.429
2010	45.758
2011	59.202
2012	59.857
2013	60.086
2014	60.387
2015	60.617
2016	60.661
2017	61.087
2018	61.231
2019	61.314
2020	61.131
2021	60.399
2022	60.892