Year | Value | 2021 | 53.125395853988 | 2020 | 53.305011266336 | 2019 | 53.48463271744 | 2018 | 53.664245155475 | 2017 | 53.84386660658 | 2016 | 54.041901757549 | 2015 | 54.199783686345 | 2014 | 54.321123028391 | 2013 | 54.442462370437 | 2012 | 54.563801712483 | 2011 | 54.685141054529 | 2010 | 54.806480396575 | 2009 | 54.980226228031 | 2008 | 55.153972059486 | 2007 | 55.327717890942 | 2006 | 55.501463722398 | 2005 | 55.675209553853 | 2004 | 55.848955385309 | 2003 | 56.022701216764 | 2002 | 56.19644704822 | 2001 | 56.370192879675 | 2000 | 56.543938711131 | 1999 | 56.744266786841 | 1998 | 56.944594862551 | 1997 | 57.14492293826 | 1996 | 57.34525101397 | 1995 | 57.54557908968 | 1994 | 57.74590716539 | 1993 | 57.9462352411 | 1992 | 58.146563316809 | 1991 | 58.346891392519 | 1990 | 58.547219468229 |
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