| Year | Value | | 2021 | 34.706698020893 | | 2020 | 34.677991925494 | | 2019 | 34.651417321305 | | 2018 | 34.625955187152 | | 2017 | 34.602512627898 | | 2016 | 34.579070068644 | | 2015 | 34.560160600958 | | 2014 | 34.527169127169 | | 2013 | 34.498653198653 | | 2012 | 34.465673960896 | | 2011 | 34.437161724718 | | 2010 | 34.408649488541 | | 2009 | 34.378184878301 | | 2008 | 34.35217503884 | | 2007 | 34.321721682848 | | 2006 | 34.295715210356 | | 2005 | 34.265273103805 | | 2004 | 34.239269997411 | | 2003 | 34.208839135499 | | 2002 | 34.182839394332 | | 2001 | 34.156839653164 | | 2000 | 34.130839911997 | | 1999 | 34.120654846642 | | 1998 | 34.110469781286 | | 1997 | 34.100284715931 | | 1996 | 34.090099650576 | | 1995 | 34.079914585221 | | 1994 | 34.069729519865 | | 1993 | 34.05954445451 |
|