| Year | Value | | 2022 | 20.183636661748 | | 2021 | 9.3631391769522 | | 2020 | 2.7324920941943 | | 2019 | 7.8867174561113 | | 2018 | 10.951855935318 | | 2017 | 14.438322748875 | | 2016 | 13.91271019978 | | 2015 | 48.699864643442 | | 2014 | 12.071856287425 | | 2013 | 0.23894862604541 | | 2012 | 0.56872797180386 | | 2011 | 7.9557246627465 | | 2010 | 9.3729310507898 | | 2009 | 15.881192459448 | | 2008 | 25.226461707384 | | 2007 | 12.838779619018 | | 2006 | 9.0525249113325 | | 2005 | 13.569576490925 | | 2004 | 9.0480678605089 | | 2003 | 5.1796778190831 | | 2002 | 0.75742084639286 | | 2001 | 11.958808539046 | | 2000 | 28.203097238855 | | 1999 | 22.683671806135 | | 1998 | 10.577161148251 | | 1997 | 15.940599414943 | | 1996 | 80.325501455174 | | 1995 | 376.74617476821 | | 1994 | 891.1877481337 | | 1993 | 4,734.9143474458 |
|