Year	years
1960	49.557
1961	51.422
1962	53.047
1963	54.617
1964	55.998
1965	57.466
1966	58.851
1967	60.172
1968	61.423
1969	62.709
1970	63.556
1971	64.658
1972	65.414
1973	66.229
1974	66.935
1975	67.484
1976	68.132
1977	68.718
1978	68.972
1979	69.554
1980	69.821
1981	70.269
1982	70.465
1983	70.684
1984	71.154
1985	71.269
1986	71.469
1987	71.6
1988	71.715
1989	71.787
1990	71.84
1991	72.05
1992	72.112
1993	72.578
1994	72.596
1995	72.802
1996	73.182
1997	73.233
1998	73.245
1999	73.735
2000	74.099
2001	74.634
2002	74.772
2003	75.126
2004	75.308
2005	75.617
2006	75.842
2007	76.281
2008	76.838
2009	77.323
2010	77.737
2011	77.882
2012	78.03
2013	78.126
2014	78.2
2015	78.342
2016	78.462
2017	78.612
2018	78.816
2019	78.98
2020	78.165
2021	77.757
2022	78.242