Year	years
1960	43.608
1961	43.467
1962	42.569
1963	43.476
1964	43.357
1965	43.279
1966	43.042
1967	43.043
1968	43.075
1969	43.235
1970	43.625
1971	44.156
1972	44.885
1973	45.6
1974	46.74
1975	47.693
1976	48.781
1977	50.136
1978	51.386
1979	52.923
1980	54.629
1981	56.81
1982	59.171
1983	61.288
1984	63.268
1985	65.195
1986	66.913
1987	67.239
1988	67.901
1989	68.102
1990	68.517
1991	69.007
1992	69.307
1993	69.202
1994	69.169
1995	69.518
1996	70.4
1997	70.925
1998	71.262
1999	71.414
2000	71.949
2001	72.197
2002	72.559
2003	72.25
2004	72.812
2005	73.075
2006	73.379
2007	73.735
2008	74.071
2009	74.864
2010	74.873
2011	75.236
2012	75.478
2013	75.84
2014	76.467
2015	76.824
2016	76.803
2017	76.821
2018	77.205
2019	77.76
2020	75.912
2021	77.959
2022	78.457