Year | Value | 2022 | 35.318960376811 | 2021 | 34.692096522741 | 2020 | 34.163703133845 | 2019 | 34.249870148267 | 2018 | 33.253228468783 | 2017 | 32.330733346006 | 2016 | 31.40781636844 | 2015 | 30.606630621403 | 2014 | 29.924951194634 | 2013 | 29.177887505516 | 2012 | 28.55629859419 | 2011 | 27.918659933853 | 2010 | 27.111456988839 | 2009 | 26.503222584622 | 2008 | 25.960949724471 | 2007 | 25.481667158164 | 2006 | 25.053156912495 | 2005 | 24.664842504972 | 2004 | 24.397401887774 | 2003 | 24.181640518973 | 2002 | 24.102287370385 | 2001 | 24.118086768187 | 2000 | 24.163412376696 | 1999 | 24.219541678455 | 1998 | 24.140426301731 | 1997 | 24.098504837291 | 1996 | 24.086287050683 | 1995 | 24.021698157659 | 1994 | 23.928372047865 | 1993 | 23.89583385525 | 1992 | 23.908986040724 | 1991 | 23.932891195309 |
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