Year | Value | 2022 | 75.392204875402 | 2021 | 75.071979817936 | 2020 | 74.108364716861 | 2019 | 73.402847031982 | 2018 | 72.818815938254 | 2017 | 73.158332717589 | 2016 | 73.468086684063 | 2015 | 74.279906314133 | 2014 | 74.068812089208 | 2013 | 74.511892679335 | 2012 | 74.830157596684 | 2011 | 73.515201301189 | 2010 | 73.44619889975 | 2009 | 75.324361927406 | 2008 | 75.161019575003 | 2007 | 75.117112288182 | 2006 | 74.880549122585 | 2005 | 74.149236328968 | 2004 | 73.52847124876 | 2003 | 72.893461665662 | 2002 | 72.864065173185 | 2001 | 72.624290143671 | 2000 | 72.499468686281 | 1999 | 72.471065290933 | 1998 | 72.463832143136 | 1997 | 72.485465336848 | 1996 | 72.417570441991 | 1995 | 72.489366576903 | 1994 | 72.474042035671 | 1993 | 72.098461448381 | 1992 | 71.753317133284 | 1991 | 71.562708602475 |
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