| Year | Value | | 2022 | 76.13632017804 | | 2021 | 72.248260524265 | | 2020 | 68.90106580155 | | 2019 | 63.667433646854 | | 2018 | 59.431577674168 | | 2017 | 54.37669735757 | | 2016 | 52.235500967984 | | 2015 | 48.862416852905 | | 2014 | 46.058704174694 | | 2013 | 43.261969929862 | | 2012 | 40.403924179991 | | 2011 | 37.354129127753 | | 2010 | 34.228932476241 | | 2009 | 29.513251543488 | | 2008 | 25.275119662467 | | 2007 | 20.808844235385 | | 2006 | 16.675706181456 | | 2005 | 14.730856117345 | | 2004 | 12.666021309638 | | 2003 | 10.611569832431 | | 2002 | 9.0645181973884 | | 2001 | 7.3167273823763 | | 2000 | 5.6379836769201 | | 1999 | 3.4426507153531 | | 1998 | 1.9024575748311 | | 1997 | 1.0940212991458 | | 1996 | 0.47190739456189 | | 1995 | 0.19508868295345 | | 1994 | 0.10910027232964 | | 1993 | 0.063062439034312 | | 1992 | 0.031765035017205 | | 1991 | 0.015138365925669 | | 1990 | 0.0073482395036631 |
|