Year | Value | 2022 | 39.810568524877 | 2021 | 39.402578478887 | 2020 | 39.063651306467 | 2019 | 38.979826800821 | 2018 | 37.939269873763 | 2017 | 36.88141923436 | 2016 | 35.830096568435 | 2015 | 34.802539428447 | 2014 | 33.612071208236 | 2013 | 32.570767904019 | 2012 | 31.537001530029 | 2011 | 30.643980611336 | 2010 | 29.774600096946 | 2009 | 27.03699865271 | 2008 | 26.33313167106 | 2007 | 25.477692654349 | 2006 | 24.591418613414 | 2005 | 24.046162807631 | 2004 | 23.660372143279 | 2003 | 23.394149185363 | 2002 | 23.19645137442 | 2001 | 23.077674509476 | 2000 | 23.090285317236 | 1999 | 22.888080181363 | 1998 | 22.832010561705 | 1997 | 22.814162365235 | 1996 | 22.801176584672 | 1995 | 22.798546468216 | 1994 | 22.809137954515 | 1993 | 22.804604106083 | 1992 | 22.832009686955 | 1991 | 22.858707557503 |
|