Year | Value | 2022 | 74.35987463318 | 2021 | 74.245254517404 | 2020 | 74.154175661548 | 2019 | 74.168522088037 | 2018 | 73.979461465543 | 2017 | 73.608642442465 | 2016 | 73.345450076232 | 2015 | 73.037227386957 | 2014 | 71.446454845839 | 2013 | 69.580439615386 | 2012 | 68.648913983495 | 2011 | 67.546016958688 | 2010 | 67.005583738953 | 2009 | 66.557428864945 | 2008 | 66.514355323631 | 2007 | 65.579143572565 | 2006 | 64.937872305689 | 2005 | 64.36243452882 | 2004 | 63.055285882173 | 2003 | 61.623248630826 | 2002 | 61.031612268517 | 2001 | 59.113293883766 | 2000 | 58.404541792277 | 1999 | 57.739729919975 | 1998 | 57.505658743884 | 1997 | 57.479849073749 | 1996 | 57.672066959608 | 1995 | 58.033093028229 | 1994 | 58.424262600126 | 1993 | 58.370145924507 | 1992 | 58.596834486579 | 1991 | 58.955654307152 |
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