Year	years
1960	51.114
1961	51.513
1962	52.066
1963	52.623
1964	53.11
1965	53.581
1966	54.038
1967	54.459
1968	54.873
1969	55.242
1970	55.601
1971	55.965
1972	56.287
1973	56.55
1974	56.77
1975	56.95
1976	57.086
1977	57.206
1978	57.28
1979	57.388
1980	57.485
1981	57.627
1982	57.889
1983	58.235
1984	58.583
1985	58.853
1986	58.981
1987	59.027
1988	59.143
1989	59.334
1990	59.457
1991	59.714
1992	60.002
1993	60.29
1994	60.462
1995	60.756
1996	61.075
1997	61.307
1998	61.402
1999	61.454
2000	61.253
2001	61.577
2002	61.619
2003	61.663
2004	61.715
2005	61.765
2006	61.811
2007	61.745
2008	61.664
2009	61.672
2010	61.668
2011	61.687
2012	61.827
2013	61.924
2014	62.106
2015	62.307
2016	62.559
2017	62.77
2018	62.996
2019	63.233
2020	63.426
2021	63.692
2022	63.546