Year | Value | 2021 | 79.102217020713 | 2020 | 79.176257563044 | 2019 | 79.250298105375 | 2018 | 79.324338647706 | 2017 | 79.398379190037 | 2016 | 79.472419732368 | 2015 | 79.548692531908 | 2014 | 79.616909861767 | 2013 | 79.685126970808 | 2012 | 79.753344300667 | 2011 | 79.821561630526 | 2010 | 79.889778960385 | 2009 | 79.911657907521 | 2008 | 79.933536854657 | 2007 | 79.955415801793 | 2006 | 79.977294748929 | 2005 | 79.999173696065 | 2004 | 80.021052643201 | 2003 | 80.042931590337 | 2002 | 80.064810537473 | 2001 | 80.086689484609 | 2000 | 80.108568431745 | 1999 | 80.135444949874 | 1998 | 80.162321688822 | 1997 | 80.18919842777 | 1996 | 80.216075166718 | 1995 | 80.242951684847 | 1994 | 80.269828423795 | 1993 | 80.296705162744 | 1992 | 80.323581901691 | 1991 | 80.350458419821 | 1990 | 80.377335158769 |
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