Year | Value | 2022 | 32.991959978152 | 2021 | 33.157815650069 | 2020 | 33.350582801368 | 2019 | 33.525556260825 | 2018 | 33.700256572992 | 2017 | 33.865672331465 | 2016 | 34.022092284902 | 2015 | 34.170793455402 | 2014 | 34.31087262656 | 2013 | 34.444459159124 | 2012 | 34.575230734913 | 2011 | 34.707019370895 | 2010 | 34.850756920415 | 2009 | 35.012285144356 | 2008 | 35.185049571571 | 2007 | 35.361202734745 | 2006 | 35.534675622279 | 2005 | 35.702153882292 | 2004 | 35.86791748911 | 2003 | 36.028547358924 | 2002 | 36.180236890429 | 2001 | 36.315095928848 | 2000 | 36.428396865358 | 1999 | 36.517662277315 | 1998 | 36.599510412859 | 1997 | 36.672741336773 | 1996 | 36.735863953197 | 1995 | 36.795659963028 | 1994 | 36.870924120901 | 1993 | 36.94331931089 | 1992 | 37.017706706552 | 1991 | 37.117414914231 | 1990 | 37.260811416832 | 1989 | 37.453421725429 | 1988 | 37.794333286431 | 1987 | 38.262027938133 | 1986 | 38.731729289095 | 1985 | 39.22443503819 | 1984 | 39.762712361882 | 1983 | 40.315830473421 | 1982 | 40.860788211754 | 1981 | 41.408100521996 | 1980 | 41.925785373855 | 1979 | 42.349648233635 | 1978 | 42.858926061045 | 1977 | 43.446140208996 | 1976 | 44.031843706682 | 1975 | 44.628900833811 | 1974 | 45.245723052845 | 1973 | 45.886143507014 | 1972 | 46.532490359817 | 1971 | 47.18371979964 | 1970 | 47.848976184407 | 1969 | 48.536340711719 | 1968 | 49.23321700746 | 1967 | 49.930727296928 | 1966 | 50.627025214072 | 1965 | 51.336654532896 | 1964 | 52.066036538385 | 1963 | 52.782439293803 | 1962 | 53.497768327478 | 1961 | 54.212664917042 | 1960 | 54.95183602008 |
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