Annual years
1960 41.08512157075042
1961 41.43308373672734
1962 41.77260935558191
1963 41.92651921858623
1964 42.579931624779334
1965 42.64014533754231
1966 42.474126614486245
1967 43.236467248141125
1968 43.61834500173676
1969 43.914315695907725
1970 44.249287465021055
1971 44.73115321403595
1972 44.528039719459805
1973 45.273254776242176
1974 45.36436851435735
1975 45.646930824399924
1976 46.35758065450202
1977 46.68983361543076
1978 46.91830076200227
1979 47.35908809040486
1980 47.70533850225828
1981 47.9326268966296
1982 48.02010632854628
1983 46.74429318655434
1984 46.56267758360002
1985 46.962442941163054
1986 47.804248615693375
1987 48.51998682747827
1988 48.05542012519268
1989 49.64479083487699
1990 49.69634663175813
1991 49.69365298790891
1992 49.59358259759851
1993 50.40780404746968
1994 51.126886983386704
1995 50.85319161558504
1996 50.97989011822022
1997 51.44118485025102
1998 51.00856560104039
1999 52.23816694651127
2000 53.21481249431119
2001 53.729475440912786
2002 54.21380923382433
2003 55.30958747548682
2004 55.79377414002128
2005 56.3924136820081
2006 57.24770559693429
2007 57.92882081802378
2008 58.50345761019217
2009 59.219105816255585
2010 59.72513945086628
2011 60.30491200870389
2012 60.557899864509174
2013 60.92835208075893
2014 61.31160575728939
2015 61.699518413970566
2016 62.21424114992841
2017 62.623713909070936
2018 62.995203917953226
2019 63.4239909431004
2020 62.95453253646142
2021 62.49610950800659
2022 63.011310391923914