Year | Value | 2021 | 16.734552985847 | 2020 | 16.724197445633 | 2019 | 16.713841905419 | 2018 | 16.703486365205 | 2017 | 16.694286207492 | 2016 | 16.682490635088 | 2015 | 16.670406877384 | 2014 | 16.632774603394 | 2013 | 16.594282952427 | 2012 | 16.556652627218 | 2011 | 16.519022302009 | 2010 | 16.4813919768 | 2009 | 16.474832562314 | 2008 | 16.468273147829 | 2007 | 16.461429582449 | 2006 | 16.454018227009 | 2005 | 16.446891504712 | 2004 | 16.44146787724 | 2003 | 16.434908689198 | 2002 | 16.428349501157 | 2001 | 16.421506861138 | 2000 | 16.414947786312 | 1999 | 16.374212479503 | 1998 | 16.333477172693 | 1997 | 16.292741865884 | 1996 | 16.252006559075 | 1995 | 16.211271252266 | 1994 | 16.170535945456 | 1993 | 16.129800638647 | 1992 | 16.089065331837 |
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