Year	years
1960	44.254
1961	44.618
1962	44.999
1963	45.287
1964	45.773
1965	46.268
1966	46.861
1967	47.424
1968	48.01
1969	48.483
1970	48.957
1971	49.48
1972	50.091
1973	50.852
1974	51.5
1975	52.252
1976	53.029
1977	53.817
1978	54.669
1979	55.404
1980	55.992
1981	56.514
1982	57.087
1983	56.319
1984	58.161
1985	58.946
1986	59.607
1987	60.191
1988	60.721
1989	61.04
1990	60.919
1991	60.355
1992	59.188
1993	57.475
1994	55.316
1995	53.065
1996	50.959
1997	49.167
1998	47.46
1999	46.188
2000	45.1
2001	43.747
2002	42.298
2003	41.65
2004	41.054
2005	40.825
2006	41.531
2007	42.083
2008	42.602
2009	43.549
2010	44.923
2011	46.242
2012	47.703
2013	49.075
2014	50.315
2015	52.062
2016	53.469
2017	54.47
2018	55.882
2019	56.975
2020	56.026
2021	53.366
2022	52.647