| Year | Value | | 2022 | 78.708821614433 | | 2021 | 78.141308993044 | | 2020 | 77.292347501925 | | 2019 | 77.877431130196 | | 2018 | 77.499266298766 | | 2017 | 78.660555884202 | | 2016 | 78.531664330959 | | 2015 | 77.943508022057 | | 2014 | 79.107113485502 | | 2013 | 80.01770626502 | | 2012 | 77.819612847845 | | 2011 | 80.166662956187 | | 2010 | 81.744102989941 | | 2009 | 79.547771769359 | | 2008 | 77.390147688496 | | 2007 | 77.490402943362 | | 2006 | 80.819360302707 | | 2005 | 79.238538516265 | | 2004 | 82.230519766962 | | 2003 | 82.731636590971 | | 2002 | 82.279915278482 | | 2001 | 82.515329006272 | | 2000 | 83.48010989315 | | 1999 | 87.722777296676 | | 1998 | 86.430626528039 | | 1997 | 87.983637460749 | | 1996 | 89.980682178589 | | 1995 | 89.076565951533 |
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