Year	years
1960	43.452
1961	43.563
1962	43.877
1963	44.1
1964	44.3
1965	44.544
1966	44.76
1967	44.97
1968	45.173
1969	45.37
1970	45.557
1971	45.747
1972	45.94
1973	46.131
1974	43.818
1975	44.182
1976	44.568
1977	46.918
1978	46.95
1979	47.305
1980	47.489
1981	47.666
1982	47.83
1983	48.166
1984	48.459
1985	48.281
1986	48.37
1987	48.903
1988	43.835
1989	46.717
1990	47.105
1991	26.565
1992	27.312
1993	50.648
1994	50.327
1995	50.6
1996	50.447
1997	50.195
1998	50.66
1999	50.525
2000	50.66
2001	50.74
2002	50.731
2003	50.614
2004	50.538
2005	50.661
2006	50.597
2007	50.515
2008	51.12
2009	51.853
2010	50.563
2011	51.304
2012	53.161
2013	53.843
2014	54.277
2015	54.857
2016	55.044
2017	55.654
2018	56.375
2019	57.078
2020	55.967
2021	55.28
2022	56.107