Year	years
1960	45.121
1961	46.083
1962	47.226
1963	47.5
1964	48.52
1965	47.858
1966	49.453
1967	49.707
1968	49.982
1969	50.066
1970	44.485
1971	22.302
1972	50.594
1973	50.793
1974	50.184
1975	51.245
1976	51.894
1977	52.21
1978	52.354
1979	52.586
1980	52.848
1981	53.215
1982	53.518
1983	53.961
1984	54.331
1985	54.439
1986	55.152
1987	55.516
1988	55.62
1989	56.135
1990	57.211
1991	55.217
1992	58.192
1993	58.575
1994	59.113
1995	59.905
1996	60.341
1997	61.526
1998	63.877
1999	66.394
2000	65.472
2001	65.665
2002	65.74
2003	65.648
2004	66.038
2005	66.005
2006	65.911
2007	65.417
2008	65.597
2009	66.111
2010	67.165
2011	67.339
2012	67.605
2013	67.108
2014	67.876
2015	68.498
2016	69.085
2017	69.822
2018	70.889
2019	70.713
2020	70.187
2021	70.599
2022	71.514