Year | Value | 2021 | 13.361038005198 | 2020 | 14.36691503488 | 2019 | 14.768769668918 | 2018 | 14.833403286525 | 2017 | 15.00552855035 | 2016 | 14.91277755321 | 2015 | 14.769560455383 | 2014 | 14.429654058686 | 2013 | 15.08116107638 | 2012 | 14.92876344612 | 2011 | 14.520263405938 | 2010 | 13.650757475199 | 2009 | 13.570221934492 | 2008 | 13.673092810535 | 2007 | 14.611690067166 | 2006 | 14.222229522887 | 2005 | 14.484686363317 | 2004 | 15.406466664956 | 2003 | 14.98580461081 | 2002 | 14.564831723141 | 2001 | 14.7414666829 | 2000 | 14.474986055754 | 1999 | 14.870063378197 | 1998 | 14.367270326214 | 1997 | 15.084646356412 | 1996 | 15.296063151392 | 1995 | 16.238177392054 | 1994 | 16.652120591628 | 1993 | 18.748211251776 |
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