Year | Value | 2021 | 14.820289449567 | 2020 | 14.159789293618 | 2019 | 14.131578381039 | 2018 | 14.55948438223 | 2017 | 14.036469507957 | 2016 | 13.723698725052 | 2015 | 14.344685399192 | 2014 | 15.397094975691 | 2013 | 15.41639688542 | 2012 | 15.558109351495 | 2011 | 16.043655943538 | 2010 | 15.555024600676 | 2009 | 15.299398398457 | 2008 | 17.102444235244 | 2007 | 17.350528271763 | 2004 | 14.362357526374 | 2003 | 14.518080170474 | 2002 | 14.470349734771 | 2001 | 15.418663354474 | 2000 | 14.62314588175 | 1999 | 13.10265107036 |
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