| Year | Value | | 2022 | 86.298318001884 | | 2021 | 87.681050469747 | | 2020 | 93.594863680901 | | 2019 | 90.196824681289 | | 2018 | 89.472132119408 | | 2017 | 90.924827024307 | | 2016 | 89.930472514507 | | 2015 | 89.480570711074 | | 2014 | 89.538883282089 | | 2013 | 89.557281173367 | | 2012 | 90.899114357171 | | 2011 | 92.656425860369 | | 2010 | 90.38986725313 | | 2009 | 93.756646522046 | | 2008 | 90.519362599349 | | 2007 | 90.226228837832 | | 2006 | 93.026784335821 | | 2005 | 94.552824078926 | | 2004 | 92.917124060716 | | 2003 | 94.894059240418 | | 2002 | 94.662568327205 | | 2001 | 95.634444928788 | | 2000 | 95.06141067071 | | 1999 | 96.254984517956 | | 1998 | 96.226250055975 | | 1997 | 95.481016840129 | | 1996 | 96.69690921223 | | 1995 | 96.212756314174 | | 1994 | 96.026167870765 | | 1993 | 96.042898768221 | | 1992 | 97.418205942542 | | 1991 | 98.590642862181 | | 1990 | 99.792422107207 | | 1989 | 98.797170212092 | | 1988 | 98.739927242433 | | 1987 | 98.705200777075 | | 1986 | 99.18004271468 | | 1985 | 97.455540038123 | | 1984 | 97.19613709934 | | 1983 | 101.0116283499 | | 1982 | 99.442168599054 | | 1981 | 99.48540001681 | | 1980 | 102.24160879755 |
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