Year	years
1960	47.289
1961	48.127
1962	48.827
1963	49.394
1964	49.922
1965	50.261
1966	50.693
1967	51.067
1968	51.309
1969	51.729
1970	52.096
1971	52.547
1972	53.16
1973	53.989
1974	54.125
1975	54.657
1976	54.504
1977	54.877
1978	55.212
1979	56.148
1980	57.05
1981	58.992
1982	59.014
1983	59.298
1984	59.163
1985	58.851
1986	58.639
1987	58.437
1988	57.826
1989	57.337
1990	56.744
1991	56.038
1992	55.138
1993	54.593
1994	54.311
1995	53.767
1996	53.326
1997	53.053
1998	52.919
1999	53.009
2000	53.162
2001	53.341
2002	53.86
2003	54.471
2004	55.225
2005	56.107
2006	56.805
2007	57.473
2008	57.973
2009	58.521
2010	58.902
2011	59.095
2012	59.169
2013	59.576
2014	59.689
2015	59.693
2016	60.149
2017	60.093
2018	60.288
2019	60.678
2020	60.372
2021	58.935
2022	59.579