| Year | Value | | 2022 | 89.101069219722 | | 2021 | 88.147974106152 | | 2020 | 86.217661319784 | | 2019 | 86.346887301622 | | 2018 | 86.720810239425 | | 2017 | 86.23356632542 | | 2016 | 85.717244004 | | 2015 | 85.071426271153 | | 2014 | 82.111687056393 | | 2013 | 82.440609527472 | | 2012 | 83.396063098437 | | 2011 | 82.052640025678 | | 2010 | 81.444240184153 | | 2009 | 80.222665439481 | | 2008 | 80.053984274146 | | 2007 | 79.655220908802 | | 2006 | 78.510866010068 | | 2005 | 76.777380837437 | | 2004 | 76.484723299463 | | 2003 | 76.317492796593 | | 2002 | 76.963898776442 | | 2001 | 76.338619277905 | | 2000 | 75.757281530406 | | 1999 | 76.475334057564 | | 1998 | 76.206313374379 | | 1997 | 76.091657719344 | | 1996 | 76.049245704744 | | 1995 | 75.857660175979 | | 1994 | 75.608014552168 | | 1993 | 75.406713973193 | | 1992 | 75.176407036024 | | 1991 | 74.813094828575 |
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