Year | Value | 2019 | 33.24422861681 | 2018 | 37.095646010464 | 2017 | 39.880179956122 | 2016 | 38.924098410726 | 2015 | 37.598098602291 | 2014 | 24.548808520831 | 2013 | 23.837295555239 | 2012 | 24.429313423057 | 2011 | 39.416810844766 | 2010 | 18.905245726907 | 2009 | 18.557461980871 | 2008 | 10.656634368538 | 2007 | 8.9092608163614 | 2006 | 6.6444018317837 | 2005 | 6.5702205876703 | 2002 | 12.33668601248 | 2001 | 11.440616774975 | 2000 | 15.014451816331 | 1999 | 15.103117448937 | 1998 | 20.180542639081 | 1997 | 12.171469072868 | 1996 | 11.520128858053 | 1995 | 16.880060624531 | 1994 | 75.955712920812 | 1993 | 5.1878172588832 | 1992 | 25.760869565217 |
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