Year | Value | 2022 | 35.642588484868 | 2021 | 35.078626099503 | 2020 | 34.614143375279 | 2019 | 34.322672396932 | 2018 | 32.562541927483 | 2017 | 30.245161465674 | 2016 | 27.693921933413 | 2015 | 33.413439391791 | 2014 | 32.493869859902 | 2013 | 31.655719593518 | 2012 | 30.789777595182 | 2011 | 29.904704475228 | 2010 | 29.171206825574 | 2009 | 28.344641513561 | 2008 | 27.506375089538 | 2007 | 26.578768692993 | 2006 | 25.808231089624 | 2005 | 25.021752982525 | 2004 | 24.123467835734 | 2003 | 23.207753284019 | 2002 | 22.308388920793 | 2001 | 21.609868774946 | 2000 | 21.04542922204 | 1999 | 20.653696781811 | 1998 | 20.374708022763 | 1997 | 20.12175491093 | 1996 | 20.021188577914 | 1995 | 19.926010739835 | 1994 | 19.836162243423 | 1993 | 19.73820705255 | 1992 | 19.74330879537 | 1991 | 19.743316990108 |
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