Year | Value | 2022 | 65.967131401399 | 2021 | 66.553161609816 | 2020 | 71.466708032187 | 2019 | 69.700378529728 | 2018 | 68.076297615001 | 2017 | 71.088006515452 | 2016 | 71.713731412667 | 2015 | 70.445217927147 | 2014 | 71.790332785018 | 2013 | 71.840922262854 | 2012 | 69.414155534085 | 2011 | 68.010446817713 | 2010 | 70.212965393566 | 2009 | 75.423081258536 | 2008 | 66.728688217498 | 2007 | 66.075919268566 | 2006 | 66.164753727114 | 2005 | 66.81331182122 | 2004 | 67.409240281459 | 2003 | 68.583734597449 | 2002 | 69.102072849822 | 2001 | 65.821499000222 | 2000 | 61.278630475171 | 1999 | 68.12234987172 | 1998 | 76.201037182897 | 1997 | 75.820251234358 | 1996 | 71.515193230725 | 1995 | 71.164457308711 | 1994 | 69.899500613999 | 1993 | 65.282082677395 | 1992 | 51.31877958969 | 1991 | 63.455130496961 | 1990 | 69.654299906861 | 1989 | 65.270506108202 | 1988 | 71.68257533221 |
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