| Year | Value | | 2021 | 62.88028717 | | 2020 | 54.60136976 | | 2019 | 50.49119407 | | 2018 | 43.8 | | 2017 | 33.8207289 | | 2016 | 28.99707305 | | 2015 | 26.80260496 | | 2014 | 24.76171215 | | 2013 | 23.1093 | | 2012 | 20.32138772 | | 2011 | 18.9 | | 2010 | 15.9 | | 2009 | 12.11 | | 2008 | 10.08 | | 2007 | 6.11 | | 2006 | 5.5 | | 2005 | 4.2 | | 2004 | 3.2 | | 2003 | 2.5 | | 2002 | 1.9 | | 2001 | 1.5 | | 2000 | 1.177397269 | | 1999 | 0.845428741 | | 1998 | 0.425253672 | | 1997 | 0.256960679 | | 1996 | 0.086389581 |
|