Year | Value | 2022 | 22.280348784259 | 2021 | 22.524036813683 | 2020 | 22.768376883431 | 2019 | 23.002842565904 | 2018 | 23.243952669545 | 2017 | 23.470464425974 | 2016 | 23.691837293506 | 2015 | 23.908306308996 | 2014 | 24.122426963066 | 2013 | 24.323392384519 | 2012 | 24.530247990246 | 2011 | 24.745800891601 | 2010 | 24.972585705566 | 2009 | 25.203646061179 | 2008 | 25.431645993408 | 2007 | 25.658647519775 | 2006 | 25.888000331242 | 2005 | 26.126041351206 | 2004 | 26.36908939359 | 2003 | 26.614856651019 | 2002 | 26.86567831704 | 2001 | 27.109303022317 | 2000 | 27.325458869076 | 1999 | 27.51799856271 | 1998 | 27.69681979217 | 1997 | 27.869999913002 | 1996 | 28.046418062696 | 1995 | 28.227669226628 | 1994 | 28.408878598111 | 1993 | 28.589622921165 | 1992 | 28.754433970503 | 1991 | 28.912992000771 | 1990 | 29.087259311758 | 1989 | 29.237996962603 | 1988 | 29.349605905864 | 1987 | 29.511569524189 | 1986 | 29.682615622827 | 1985 | 29.77509613165 | 1984 | 29.831284323229 | 1983 | 29.902562033127 | 1982 | 30.014152504267 | 1981 | 30.172278504496 | 1980 | 30.417206608406 | 1979 | 30.665646423198 | 1978 | 30.915565950664 | 1977 | 31.166851194318 | 1976 | 31.416167670229 | 1975 | 31.644884128822 | 1974 | 31.905051078994 | 1973 | 32.212206854197 | 1972 | 32.53081442102 | 1971 | 32.871537390269 | 1970 | 33.271724215306 | 1969 | 33.693029584593 | 1968 | 34.124601430634 | 1967 | 34.630638721476 | 1966 | 35.18251836764 | 1965 | 35.74062705741 | 1964 | 36.300189089426 | 1963 | 36.861083503791 | 1962 | 37.422977484544 | 1961 | 37.918970628371 | 1960 | 38.401808392621 |
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