Year | Value | 2021 | 25.630837601601 | 2020 | 25.811665968138 | 2019 | 25.991142317191 | 2018 | 26.172624567341 | 2017 | 26.349098187953 | 2016 | 26.527400143068 | 2015 | 26.709789308799 | 2014 | 26.884597199293 | 2013 | 27.059318478747 | 2012 | 27.233762284607 | 2011 | 27.576769975472 | 2010 | 27.75296291863 | 2009 | 27.903340263636 | 2008 | 28.048525937487 | 2007 | 28.197945486638 | 2006 | 28.347370581651 | 2005 | 28.49672570118 | 2004 | 28.646171318397 | 2003 | 28.824088979902 | 2002 | 28.973622338415 | 2001 | 29.123155696929 | 2000 | 29.272689055442 | 1999 | 29.412277504501 | 1998 | 29.55186595356 | 1997 | 29.69145440262 | 1996 | 29.831042851679 | 1995 | 29.970631300739 | 1994 | 30.110219749798 | 1993 | 30.249808198857 | 1992 | 30.485359514693 | 1991 | 30.625493087031 | 1990 | 30.765626659369 |
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