Year | Value | 2022 | 33.172342961084 | 2021 | 32.842832388301 | 2020 | 31.158468473473 | 2019 | 31.425910436762 | 2018 | 32.103987522927 | 2017 | 31.973324584982 | 2016 | 31.404179780161 | 2015 | 32.04423740139 | 2014 | 32.982830168168 | 2013 | 33.189159701178 | 2012 | 34.24125858447 | 2011 | 35.023912294083 | 2010 | 35.676471296383 | 2009 | 34.355881093956 | 2008 | 36.714197119311 | 2007 | 36.214493799691 | 2006 | 35.375414394592 | 2005 | 33.613051616798 | 2004 | 33.058765102018 | 2003 | 30.973264574212 | 2002 | 29.401888524443 | 2001 | 28.562577903266 | 2000 | 28.383826019641 | 1999 | 27.600255344879 | 1998 | 28.153890690848 | 1997 | 29.010382476958 | 1996 | 29.0089083245 | 1995 | 29.309813858635 | 1994 | 30.993908579799 | 1993 | 30.882040548174 | 1992 | 29.860768667459 | 1991 | 28.810661852907 | 1990 | 28.074963491818 | 1989 | 29.230199207579 | 1988 | 29.701521991017 | 1987 | 28.687010087415 | 1986 | 27.106655377399 | 1985 | 28.036733967217 | 1984 | 27.069558640548 | 1983 | 26.02913336644 | 1982 | 26.147064406465 |
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