Year	years
1960	55.931
1961	56.447
1962	56.052
1963	54.259
1964	54.918
1965	54.007
1966	53.655
1967	53.225
1968	48.21
1969	50.557
1970	50.584
1971	51.135
1972	46.984
1973	51.163
1974	49.854
1975	58.151
1976	60.558
1977	60.826
1978	61.132
1979	61.755
1980	61.982
1981	62.632
1982	62.868
1983	62.907
1984	63.063
1985	63.549
1986	63.653
1987	64.212
1988	64.195
1989	64.661
1990	64.762
1991	65.285
1992	65.358
1993	65.879
1994	65.982
1995	66.553
1996	66.696
1997	67.194
1998	67.427
1999	67.589
2000	67.773
2001	67.952
2002	68.075
2003	68.228
2004	68.348
2005	68.543
2006	68.579
2007	68.67
2008	68.613
2009	68.751
2010	68.784
2011	68.984
2012	69.007
2013	69.094
2014	69.149
2015	69.144
2016	69.18
2017	69.26
2018	69.245
2019	69.369
2020	70.787
2021	69.117
2022	69.927