| Year | Value | | 2021 | 16.6981031 | | 2020 | 16.42294727 | | 2019 | 16.15232553 | | 2018 | 15.9 | | 2017 | 15.6 | | 2016 | 15.36692386 | | 2015 | 13.85517556 | | 2014 | 7.7 | | 2013 | 4.6 | | 2012 | 2.9 | | 2011 | 1.1 | | 2010 | 0.75 | | 2009 | 0.54 | | 2008 | 0.45 | | 2007 | 0.37 | | 2006 | 0.310592657 | | 2005 | 0.219659819 | | 2004 | 0.155334521 | | 2003 | 0.105811659 | | 2002 | 0.072402262 | | 2001 | 0.037162381 | | 2000 | 0.015263767 | | 1999 | 0.012541599 | | 1998 | 0.009663517 | | 1997 | 0.00496672 | | 1996 | 0.001703448 | | 1995 | 1.75E-5 |
|