Year	years
1960	49.537
1961	50.183
1962	51.029
1963	51.525
1964	52.349
1965	53.335
1966	54.005
1967	55.307
1968	55.687
1969	56.119
1970	57.189
1971	57.989
1972	58.471
1973	59.078
1974	56.873
1975	57.434
1976	60.817
1977	61.334
1978	61.529
1979	61.91
1980	56.204
1981	52.484
1982	53.014
1983	53.236
1984	53.418
1985	53.922
1986	54.168
1987	54.587
1988	50.333
1989	53.293
1990	53.542
1991	58.436
1992	63.916
1993	63.974
1994	63.841
1995	63.66
1996	63.825
1997	63.254
1998	63.004
1999	63.295
2000	63.734
2001	64.041
2002	64.005
2003	61.525
2004	60.435
2005	60.137
2006	58.189
2007	58.215
2008	60.716
2009	63.266
2010	63.929
2011	64.876
2012	65.418
2013	65.694
2014	66.522
2015	67.515
2016	65.614
2017	67.513
2018	69.559
2019	69.559
2020	66.954
2021	68.2
2022	69.162