Year | Value | 2021 | 63.258780179351 | 2020 | 62.006721508674 | 2019 | 52.421350211973 | 2018 | 51.185914883179 | 2017 | 50.049677737493 | 2016 | 51.890527534253 | 2015 | 53.574469732615 | 2014 | 52.675848733283 | 2013 | 52.999251924674 | 2012 | 51.6464316161 | 2011 | 50.028681642542 | 2010 | 49.559823065517 | 2009 | 50.835745598346 | 2008 | 39.799702837461 | 2007 | 40.088125770283 | 2006 | 40.588396136626 | 2005 | 42.067559761433 | 2004 | 45.696638315107 | 2003 | 45.076641298664 | 2002 | 43.047339208221 | 1995 | 41.069702840345 | 1994 | 47.619729767063 | 1993 | 55.691835952472 | 1992 | 64.377297885613 | 1991 | 73.319321512093 | 1990 | 79.536617932332 |
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