Year | Value | 2022 | 91.25343357354 | 2021 | 91.249839463067 | 2020 | 91.096099895121 | 2019 | 90.383224040715 | 2018 | 90.100866567769 | 2017 | 89.843138978529 | 2016 | 89.57783431411 | 2015 | 89.248786925801 | 2014 | 89.045593839864 | 2013 | 88.804419454371 | 2012 | 88.427679161756 | 2011 | 88.335960259701 | 2010 | 88.42976192559 | 2009 | 88.409645072763 | 2008 | 88.346510577438 | 2007 | 88.008215426552 | 2006 | 87.861635378744 | 2005 | 87.636222758186 | 2004 | 87.929556815512 | 2003 | 88.632438775338 | 2002 | 88.908958054373 | 2001 | 88.868020224699 | 2000 | 88.843138844474 | 1999 | 89.008880100147 | 1998 | 89.02174400929 | 1997 | 89.057746008652 | 1996 | 89.364364457252 | 1995 | 89.280425877147 | 1994 | 89.36887561223 | 1993 | 89.669194961947 | 1992 | 89.968802382669 | 1991 | 90.330993196688 |
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