Year	years
1960	67.745
1961	67.168
1962	67.415
1963	69.508
1964	69.398
1965	67.768
1966	69.863
1967	71.168
1968	71.185
1969	72.353
1970	73.058
1971	72.096
1972	73.057
1973	73.469
1974	73.741
1975	73.957
1976	73.938
1977	73.434
1978	73.126
1979	73.287
1980	72.998
1981	73.492
1982	74.539
1983	74.559
1984	74.305
1985	74.234
1986	74.408
1987	74.255
1988	74.606
1989	74.233
1990	74.465
1991	74.331
1992	74.804
1993	74.614
1994	74.662
1995	74.719
1996	75.135
1997	76.027
1998	75.743
1999	77.269
2000	76.773
2001	76.773
2002	77.085
2003	76.388
2004	76.478
2005	77.727
2006	78.105
2007	77.835
2008	78.141
2009	78.065
2010	77.989
2011	77.115
2012	77.052
2013	78.188
2014	80.514
2015	80.616
2016	79.584
2017	78.17
2018	78.129
2019	78.797
2020	77.883
2021	76.696
2022	77.141