Annual years
1960 40.74320268298056
1961 41.071671970274906
1962 41.62237665312326
1963 41.76393400638191
1964 42.253055775010296
1965 42.401398566517535
1966 42.33486772330063
1967 42.976579370782495
1968 43.30820644319975
1969 43.56528346657549
1970 43.87857391382499
1971 44.223790242607215
1972 44.02369655049331
1973 44.76052282894577
1974 44.79944872176096
1975 45.1666195224371
1976 45.84417819976955
1977 46.212474584880056
1978 46.39335832235114
1979 46.80426001726009
1980 47.214725632848975
1981 47.51565661473694
1982 47.737663741172774
1983 46.52564001177554
1984 46.397441235739045
1985 46.76065819959353
1986 47.57774115764353
1987 48.30188300595508
1988 48.10638923331893
1989 49.17537501110079
1990 49.21020591692235
1991 49.20819670291272
1992 49.187801844134206
1993 49.79599985250528
1994 50.16104123290726
1995 50.66783570813712
1996 50.78845500003173
1997 51.136526791931146
1998 50.95230415305459
1999 51.8352413766677
2000 52.66175412095464
2001 53.13109920509466
2002 53.62999651695246
2003 54.229668876523945
2004 54.740409284175044
2005 55.40832281769307
2006 56.233620674672544
2007 56.88988798930103
2008 57.50407018553205
2009 58.24031169505169
2010 58.57768856792502
2011 59.47522039825314
2012 60.07801762292335
2013 60.64456075370131
2014 61.14707309305527
2015 61.61254772939035
2016 62.16196194022386
2017 62.54976046880772
2018 62.947575947408374
2019 63.33805694716437
2020 62.76172018146169
2021 62.30278539996223
2022 62.843246261160665