| Year | Value | | 2021 | 73.400813512055 | | 2020 | 68.387577920406 | | 2019 | 62.233376144913 | | 2018 | 54.22378708387 | | 2017 | 48.630700799443 | | 2016 | 43.127561653907 | | 2015 | 39.053153427935 | | 2014 | 34.763152780588 | | 2013 | 29.697620397922 | | 2012 | 25.991792281477 | | 2011 | 23.001539554732 | | 2010 | 20.717100324327 | | 2009 | 17.787758187624 | | 2008 | 15.089298890542 | | 2007 | 11.972849680262 | | 2006 | 9.9744060994953 | | 2005 | 8.5949163416238 | | 2004 | 7.4852027849558 | | 2003 | 4.0419775904144 | | 2002 | 2.8185747620853 | | 2001 | 1.1573394727419 | | 2000 | 0.87039174898415 | | 1999 | 0.43881067755628 | | 1998 | 0.1702641172378 | | 1997 | 0.080018704790646 | | 1996 | 0.026861696712339 | | 1995 | 0.011323049428452 | | 1994 | 0.0019944119380596 | | 1993 | 0.00024260531877835 |
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