Year | Value | 2022 | 33.622991793758 | 2021 | 33.343839261781 | 2020 | 31.591069980154 | 2019 | 31.860488556217 | 2018 | 32.599988749485 | 2017 | 32.466747805588 | 2016 | 31.933608382396 | 2015 | 32.644393498975 | 2014 | 33.57328216921 | 2013 | 33.847035999055 | 2012 | 34.945191000621 | 2011 | 35.710073621794 | 2010 | 36.380292380439 | 2009 | 35.053722758055 | 2008 | 37.449412910961 | 2007 | 36.923680917717 | 2006 | 36.025868234892 | 2005 | 34.232108914187 | 2004 | 33.53265922617 | 2003 | 31.390858182933 | 2002 | 29.780914720967 | 2001 | 28.951454106392 | 2000 | 28.78895573888 | 1999 | 27.994918869172 | 1998 | 28.561593733508 | 1997 | 29.506639151977 | 1996 | 29.526221742919 | 1995 | 29.81731655536 | 1994 | 31.546781675343 | 1993 | 31.544573252659 | 1992 | 30.492367059469 | 1991 | 29.390386652824 | 1990 | 28.635634725881 | 1989 | 29.817459547718 | 1988 | 30.338339279002 | 1987 | 29.212015845605 | 1986 | 27.576662332535 | 1985 | 28.631096810202 | 1984 | 27.636271375451 | 1983 | 26.461790363793 | 1982 | 26.5957228082 |
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