Year | Value | 2021 | 22.538011695906 | 2020 | 22.720760233918 | 2019 | 22.90350877193 | 2018 | 23.086257309942 | 2017 | 23.269005847953 | 2016 | 23.451754385965 | 2015 | 23.634502923977 | 2014 | 23.817324561403 | 2013 | 24.00014619883 | 2012 | 24.182967836257 | 2011 | 24.365789473684 | 2010 | 24.548611111111 | 2009 | 24.731359649123 | 2008 | 24.914108187134 | 2007 | 25.096856725146 | 2006 | 25.279605263158 | 2005 | 25.46235380117 | 2004 | 25.645102339181 | 2003 | 25.827850877193 | 2002 | 26.010599415205 | 2001 | 26.193347953216 | 2000 | 26.376096491228 | 1999 | 26.558881578947 | 1998 | 26.741666666667 | 1997 | 26.924451754386 | 1996 | 27.107236842105 | 1995 | 27.290021929825 | 1994 | 27.472807017544 | 1993 | 27.655592105263 | 1992 | 27.838377192982 | 1991 | 28.021162280702 | 1990 | 28.203947368421 |
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