Year	years
1960	58.252
1961	58.551
1962	58.849
1963	59.128
1964	59.271
1965	59.548
1966	59.831
1967	60.047
1968	59.954
1969	60.228
1970	60.482
1971	60.754
1972	60.991
1973	61.075
1974	61.326
1975	61.565
1976	61.753
1977	61.79
1978	62.112
1979	62.405
1980	62.729
1981	63.034
1982	63.338
1983	63.544
1984	64.004
1985	64.692
1986	64.838
1987	65.015
1988	53.036
1989	65.293
1990	65.447
1991	65.008
1992	64.747
1993	64.885
1994	65.08
1995	65.445
1996	65.82
1997	66.322
1998	66.785
1999	66.554
2000	66.89
2001	67.073
2002	67.124
2003	67.306
2004	67.494
2005	67.596
2006	67.743
2007	68.08
2008	67.995
2009	68.242
2010	68.597
2011	68.613
2012	69.037
2013	69.062
2014	69.236
2015	69.595
2016	69.673
2017	69.92
2018	69.992
2019	70.403
2020	67.051
2021	66.554
2022	67.866