Year | Value | 2021 | 26.083502042563 | 2020 | 26.251707329187 | 2019 | 26.418755014894 | 2018 | 26.587526808236 | 2017 | 26.752027594244 | 2016 | 26.916630679934 | 2015 | 27.084696879543 | 2014 | 27.248614264981 | 2013 | 27.412417047334 | 2012 | 27.576229625251 | 2011 | 27.884735729615 | 2010 | 28.049741171378 | 2009 | 28.195990420954 | 2008 | 28.341466548315 | 2007 | 28.486858963266 | 2006 | 28.632352344017 | 2005 | 28.777780597788 | 2004 | 28.923273270077 | 2003 | 29.251589658284 | 2002 | 29.397942620063 | 2001 | 29.544295581843 | 2000 | 29.690648543623 | 1999 | 29.829230275517 | 1998 | 29.967812007411 | 1997 | 30.106393739305 | 1996 | 30.244975471199 | 1995 | 30.383557203093 | 1994 | 30.522138934987 | 1993 | 30.660720666881 | 1992 | 30.799302398775 | 1991 | 30.937884130669 | 1990 | 31.076465862563 |
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