Year	years
1960	46.125
1961	46.948
1962	47.575
1963	48.304
1964	49.169
1965	50.193
1966	51.316
1967	52.394
1968	53.465
1969	54.324
1970	54.95
1971	55.322
1972	48.626
1973	55.725
1974	55.85
1975	56.036
1976	56.299
1977	56.243
1978	53.571
1979	50.813
1980	57.914
1981	58.198
1982	58.605
1983	56.794
1984	56.131
1985	56.501
1986	57.775
1987	57.66
1988	60.3
1989	62.475
1990	63.096
1991	63.931
1992	64.266
1993	64.685
1994	65.181
1995	65.608
1996	66.052
1997	66.515
1998	65.209
1999	67.12
2000	67.234
2001	67.215
2002	67.18
2003	67.217
2004	67.423
2005	67.936
2006	68.725
2007	69.559
2008	70.586
2009	71.433
2010	72.009
2011	72.416
2012	72.615
2013	72.704
2014	72.812
2015	72.983
2016	73.256
2017	73.554
2018	73.85
2019	74.054
2020	71.795
2021	73.837
2022	74.615