Year	years
1960	35.417
1961	35.932
1962	36.328
1963	36.735
1964	37.21
1965	37.582
1966	37.924
1967	38.072
1968	38.368
1969	38.821
1970	39.157
1971	39.58
1972	39.963
1973	40.384
1974	39.936
1975	39.485
1976	39.845
1977	40.274
1978	40.803
1979	41.228
1980	42.242
1981	42.659
1982	42.237
1983	42.803
1984	43.247
1985	43.552
1986	44.882
1987	44.825
1988	45.559
1989	45.244
1990	47.688
1991	48.48
1992	51.059
1993	51.91
1994	52.731
1995	53.617
1996	54.356
1997	54.81
1998	42.542
1999	35.825
2000	53.816
2001	56.557
2002	57.129
2003	57.623
2004	58.22
2005	58.783
2006	59.907
2007	60.398
2008	60.906
2009	61.529
2010	61.976
2011	62.427
2012	62.965
2013	63.181
2014	63.556
2015	64.022
2016	64.213
2017	64.552
2018	64.947
2019	65.216
2020	64.862
2021	64.35
2022	64.457