Year % 1975 8.05258919689896 1976 9.67741935483871 1977 5.29529112304736 1978 8.9768401522664 1993 16.471868200186503 1994 15.429896539422 1995 6.05302509359617 1996 10.9554264339972 1997 6.33801564429807 1998 5.84845194943925 1999 8.132210383180851 2000 16.7152320759539 2001 21.2335596729005 2002 14.8045671294564 2003 14.206236746287901 2004 26.426241807005702 2005 19.7525700997414 2006 12.9809569599869 2007 18.5642888084109 2008 30.008821106442202 2009 28.7046026648626 2010 19.606200352902402 2011 13.4553899466475 2012 16.551751043318 2013 12.8134310291589 2014 20.032819366169598 2015 9.44313439051108 2016 16.776318010514498 2017 10.8083914988029 2018 20.4489 2019 25.2808742 2020 11.451706 2021 15.868776 2022 14.6894703