Year	years
1960	50.225
1961	50.552
1962	51.439
1963	52.017
1964	52.726
1965	53.286
1966	53.883
1967	54.408
1968	55.07
1969	55.631
1970	56.173
1971	56.67
1972	57.344
1973	55.858
1974	52.965
1975	59.174
1976	59.794
1977	60.38
1978	60.947
1979	61.565
1980	62.192
1981	62.719
1982	63.425
1983	64.091
1984	64.647
1985	64.83
1986	65.56
1987	66.154
1988	66.414
1989	67.008
1990	67.449
1991	67.99
1992	68.25
1993	68.513
1994	68.809
1995	69.362
1996	69.695
1997	69.902
1998	63.617
1999	70.565
2000	70.807
2001	71.284
2002	71.441
2003	71.57
2004	72.07
2005	72.132
2006	72.306
2007	72.368
2008	72.451
2009	72.958
2010	73.278
2011	73.776
2012	74.169
2013	74.497
2014	74.632
2015	74.991
2016	75.078
2017	75.188
2018	75.318
2019	75.37
2020	73.987
2021	72.534
2022	73.157