Year | Value | 2021 | 39.538012659676 | 2020 | 39.636297541364 | 2019 | 39.73455606176 | 2018 | 39.83280717737 | 2017 | 39.940278853354 | 2016 | 40.017087072088 | 2015 | 40.115400011117 | 2014 | 40.207157555967 | 2013 | 40.296885202965 | 2012 | 40.405975857344 | 2011 | 40.49770494479 | 2010 | 40.588930893089 | 2009 | 40.66275376558 | 2008 | 40.736544163652 | 2007 | 40.810497820172 | 2006 | 40.884452068385 | 2005 | 40.887610717707 | 2004 | 40.97005005092 | 2003 | 41.024719557256 | 2002 | 41.107104336897 | 2001 | 41.189324221612 | 2000 | 41.271544106328 | 1999 | 41.359520260007 | 1998 | 41.447496413687 | 1997 | 41.535472567366 | 1996 | 41.623448721046 | 1995 | 41.711424874725 | 1994 | 41.799401028405 | 1993 | 41.771143401578 | 1992 | 41.858875429183 | 1991 | 41.771172919749 | 1990 | 41.839314039714 |
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