Year	years
1960	47.727
1961	48.208
1962	48.51
1963	45.3
1964	48.827
1965	48.8
1966	48.68
1967	48.592
1968	48.233
1969	47.844
1970	47.587
1971	47.257
1972	46.916
1973	46.213
1974	45.615
1975	44.987
1976	45.17
1977	45.479
1978	46.347
1979	47.779
1980	49.194
1981	50.736
1982	52.04
1983	52.779
1984	53.199
1985	53.444
1986	53.428
1987	53.483
1988	52.678
1989	51.744
1990	50.473
1991	48.741
1992	46.711
1993	44.668
1994	15.663
1995	41.756
1996	42.153
1997	42.451
1998	43.651
1999	45.794
2000	48.281
2001	50.11
2002	51.87
2003	54.007
2004	56.236
2005	58.206
2006	59.802
2007	61.158
2008	62.523
2009	63.403
2010	64.181
2011	65.09
2012	65.873
2013	66.089
2014	66.906
2015	67.16
2016	67.924
2017	68.104
2018	68.266
2019	68.48
2020	68.996
2021	68.164
2022	69.244