| Year | Value | | 2022 | 84.942794220973 | | 2021 | 85.860493129327 | | 2020 | 85.283706035661 | | 2019 | 85.766387789221 | | 2018 | 85.970915488715 | | 2017 | 85.5688003136 | | 2016 | 85.169171424478 | | 2015 | 84.820934716303 | | 2014 | 85.386684469559 | | 2013 | 84.920658269052 | | 2012 | 85.654135965232 | | 2011 | 85.698521199522 | | 2010 | 85.639324433494 | | 2009 | 85.200884938132 | | 2008 | 85.774983699713 | | 2007 | 85.172929273683 | | 2006 | 84.924713571662 | | 2005 | 84.770265795109 | | 2004 | 85.298615134899 | | 2003 | 84.845659553028 | | 2002 | 84.563003590776 | | 2001 | 84.78175959018 | | 2000 | 83.955581862352 | | 1999 | 82.729745502271 | | 1998 | 82.929925003712 | | 1997 | 82.748186887894 | | 1996 | 82.013742280839 | | 1995 | 82.059342858928 | | 1994 | 82.27844896149 | | 1993 | 82.086665019167 | | 1992 | 82.14123833551 | | 1991 | 82.738624000905 |
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