Year	years
1960	59.195
1961	58.202
1962	58.982
1963	58.037
1964	59.429
1965	59.609
1966	60.024
1967	60.776
1968	60.411
1969	59.891
1970	60.461
1971	60.779
1972	60.162
1973	61.553
1974	60.814
1975	61.92
1976	62.248
1977	62.309
1978	62.643
1979	63.099
1980	63.524
1981	64.374
1982	64.413
1983	65.094
1984	65.268
1985	64.859
1986	65.8
1987	66.253
1988	66.931
1989	66.627
1990	67.563
1991	67.651
1992	68.886
1993	68.91
1994	69.907
1995	70.158
1996	70.564
1997	70.232
1998	72.4
1999	71.042
2000	72.08
2001	73.425
2002	72.921
2003	74.564
2004	74.695
2005	75.403
2006	76.655
2007	77.24
2008	76.057
2009	76.332
2010	76.615
2011	76.886
2012	77.04
2013	77.184
2014	78.11
2015	77.052
2016	78.41
2017	78.56
2018	78.709
2019	78.857
2020	78.672
2021	78.564
2022	78.833