Year	years
1960	49.405
1961	49.518
1962	49.586
1963	49.742
1964	50.098
1965	50.078
1966	49.972
1967	49.985
1968	49.685
1969	49.667
1970	50.043
1971	50.022
1972	50.172
1973	50.53
1974	50.904
1975	51.349
1976	51.857
1977	52.035
1978	52.554
1979	53.017
1980	53.024
1981	53.312
1982	53.226
1983	53.48
1984	53.911
1985	54.372
1986	55.054
1987	55.607
1988	56.281
1989	56.857
1990	57.087
1991	57.356
1992	57.522
1993	57.341
1994	57.14
1995	57.578
1996	57.918
1997	58.434
1998	58.782
1999	59.224
2000	59.289
2001	59.196
2002	59.852
2003	60.434
2004	60.483
2005	61.091
2006	61.217
2007	61.661
2008	61.77
2009	62.461
2010	62.485
2011	63.233
2012	63.971
2013	64.072
2014	64.924
2015	64.987
2016	65.873
2017	65.922
2018	66.049
2019	66.825
2020	66.385
2021	66.014
2022	66.13