| Year | Value | | 2021 | 32.682675520192 | | 2020 | 32.682675520192 | | 2019 | 32.682675520192 | | 2018 | 32.683610968001 | | 2017 | 32.684546469359 | | 2016 | 32.685482024273 | | 2015 | 32.732328154561 | | 2014 | 32.722843221553 | | 2013 | 32.718986470993 | | 2012 | 32.745165547713 | | 2011 | 32.737548772091 | | 2010 | 32.730871847835 | | 2009 | 32.71133931901 | | 2008 | 32.693686716576 | | 2007 | 32.674161814897 | | 2006 | 32.653704978206 | | 2005 | 32.634189700654 | | 2004 | 32.617484301976 | | 2003 | 32.597975975459 | | 2002 | 32.5775382675 | | 2001 | 32.558039552881 | | 2000 | 32.537612838515 | | 1999 | 32.519342082641 | | 1998 | 32.500143258266 | | 1997 | 32.481879386907 | | 1996 | 32.462688704918 | | 1995 | 32.446290461186 | | 1994 | 32.429893156885 | | 1993 | 32.413496791934 | | 1992 | 32.397101366253 | | 1991 | 32.381634348237 | | 1990 | 32.366167330221 |
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