| Year | Value | | 2021 | 76.59043014 | | 2020 | 71.09999824 | | 2019 | 70.39999865 | | 2018 | 55.20000067 | | 2017 | 48.69999885 | | 2016 | 46.79128694 | | 2015 | 42.8 | | 2014 | 35.5 | | 2013 | 26.8 | | 2012 | 23.6 | | 2011 | 18.6 | | 2010 | 15.9 | | 2009 | 11.9 | | 2008 | 9.080114523 | | 2007 | 7.490604681 | | 2006 | 6.388321967 | | 2005 | 3.343509888 | | 2004 | 2.593725421 | | 2003 | 1.912595178 | | 2002 | 1.081939742 | | 2001 | 0.597567994 | | 2000 | 0.484347308 | | 1999 | 0.030688343 | | 1998 | 0.020754437 | | 1997 | 0.010536935 | | 1996 | 0.004285074 | | 1995 | 0.001527093 |
|