Year | Value | 2021 | 10.012 | 2020 | 12.18 | 2019 | 12.2 | 2018 | 13.212 | 2017 | 17.705 | 2016 | 17.617 | 2015 | 18.261 | 2014 | 17.499 | 2013 | 16.576 | 2012 | 17.511 | 2011 | 21.63 | 2010 | 19.523 | 2009 | 19.295 | 2008 | 22.974 | 2007 | 10.394 | 1999 | 11.2 | 1998 | 9.4 | 1997 | 10.8 | 1996 | 9.3 | 1995 | 6.7 | 1994 | 6.6 | 1993 | 5.3 | 1992 | 1.8 |
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