Year | Value | 2022 | 51.849020696304 | 2021 | 51.323954193723 | 2020 | 50.86446201295 | 2019 | 51.437372504363 | 2018 | 50.382100054894 | 2017 | 49.333178590642 | 2016 | 48.244784000592 | 2015 | 47.372324264012 | 2014 | 46.296299590579 | 2013 | 46.18556755351 | 2012 | 46.287813161001 | 2011 | 45.686730359671 | 2010 | 46.192818615379 | 2009 | 45.340751876792 | 2008 | 45.473769932091 | 2007 | 46.567621921217 | 2006 | 45.522844976266 | 2005 | 39.751601237898 | 2004 | 39.593803325355 | 2003 | 40.98667764786 | 2002 | 40.844348557638 | 2001 | 40.596231179677 | 2000 | 40.298683600567 | 1999 | 40.207253032302 | 1998 | 41.883088768598 | 1997 | 41.211429865216 | 1996 | 40.964893556476 | 1995 | 40.65764555657 | 1994 | 40.665127742992 | 1993 | 40.281233168789 | 1992 | 40.246933458844 | 1991 | 40.179257121383 |
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