Year	years
1960	44.74
1961	45.662
1962	46.701
1963	46.655
1964	47.741
1965	46.858
1966	48.577
1967	48.865
1968	49.09
1969	49.172
1970	42.587
1971	25.996
1972	49.591
1973	49.828
1974	49.16
1975	50.292
1976	50.647
1977	51.197
1978	51.254
1979	51.464
1980	51.85
1981	52.169
1982	52.54
1983	53.011
1984	53.54
1985	53.897
1986	54.415
1987	54.926
1988	55.027
1989	55.089
1990	55.989
1991	54.154
1992	57.635
1993	57.927
1994	58.617
1995	59.467
1996	59.492
1997	61.427
1998	63.917
1999	66.228
2000	65.779
2001	66.135
2002	66.612
2003	66.824
2004	67.187
2005	67.299
2006	67.241
2007	66.714
2008	67.051
2009	67.403
2010	68.638
2011	68.809
2012	69.554
2013	69.565
2014	69.986
2015	70.491
2016	71.09
2017	71.788
2018	72.567
2019	72.806
2020	71.968
2021	72.381
2022	73.698