Year	years
1960	46.282
1961	47.164
1962	47.992
1963	48.772
1964	49.673
1965	50.307
1966	51.612
1967	52.561
1968	53.456
1969	54.189
1970	54.971
1971	48.983
1972	55.378
1973	55.502
1974	55.427
1975	55.75
1976	55.85
1977	55.829
1978	56.267
1979	56.453
1980	56.829
1981	57.102
1982	57.353
1983	57.748
1984	58.028
1985	58.545
1986	58.844
1987	58.507
1988	58.542
1989	58.73
1990	58.984
1991	59.393
1992	59.626
1993	59.601
1994	59.711
1995	59.473
1996	59.859
1997	59.874
1998	60.237
1999	60.774
2000	61.237
2001	61.441
2002	61.749
2003	61.874
2004	61.881
2005	61.171
2006	62.076
2007	61.919
2008	61.922
2009	62.073
2010	62.309
2011	62.539
2012	62.666
2013	62.979
2014	63.129
2015	63.502
2016	63.684
2017	64.02
2018	64.222
2019	64.595
2020	63.945
2021	63.787
2022	64.134