Year	years
1960	29.035
1961	29.118
1962	29.209
1963	29.456
1964	29.74
1965	29.857
1966	30.167
1967	30.485
1968	30.908
1969	31.299
1970	31.791
1971	32.175
1972	32.992
1973	33.609
1974	34.361
1975	35.134
1976	36.126
1977	37.061
1978	38.026
1979	38.972
1980	39.898
1981	40.498
1982	41.142
1983	41.679
1984	42.192
1985	42.773
1986	43.538
1987	44.169
1988	44.804
1989	45.508
1990	46.14
1991	46.844
1992	47.088
1993	47.136
1994	47.163
1995	47.45
1996	47.659
1997	48.306
1998	48.963
1999	49.669
2000	50.37
2001	50.954
2002	51.663
2003	52.208
2004	52.74
2005	53.166
2006	53.756
2007	54.15
2008	54.492
2009	55.01
2010	55.453
2011	55.808
2012	56.101
2013	56.281
2014	56.858
2015	57.288
2016	57.777
2017	58.059
2018	58.14
2019	58.523
2020	57.385
2021	57.618
2022	58.068