Year | Value | 2021 | 44.403975575817 | 2020 | 42.901796648613 | 2019 | 33.729155622638 | 2018 | 33.139419242528 | 2017 | 32.429067118975 | 2016 | 31.366190714778 | 2015 | 30.309126137804 | 2014 | 27.421612199406 | 2013 | 27.781927217866 | 2012 | 25.034400843251 | 2011 | 24.865144669259 | 2010 | 26.166159278001 | 2009 | 29.99730638134 | 2008 | 34.225028210673 | 2003 | 29.717396246643 | 2002 | 32.224126530999 | 1999 | 45.207967107611 | 1998 | 55.204087664863 | 1997 | 72.485318525311 | 1996 | 23.92314220907 | 1995 | 30.80432488233 | 1994 | 36.57059016058 | 1993 | 37.497596852164 | 1992 | 42.709357426087 | 1991 | 40.275629566384 | 1990 | 45.741452331629 |
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