Year % 2000 5.50182988528174 2001 6.8892705160733 2002 5.85036958168089 2003 6.44567908642308 2004 6.47699404437681 2005 6.95905530880784 2006 7.12646231656009 2007 7.31599172803364 2008 9.72929704695033 2009 10.4642482320806 2010 11.8476904014013 2011 9.51586098706884 2012 8.88381797074103 2013 8.66747024581617 2014 8.71391845779398 2015 8.48449174720801 2016 9.16668704973072 2017 8.87085579071181 2018 9.93781499519491 2019 10.9598915193796 2020 11.3897914402267 2021 10.7835447006077