Year Percent 1994 35.85332 1995 20.7 1996 20.7 1997 17.51805 1998 15.96041 1999 13.26299 2000 9.00146 2001 9.12058 2002 8.8735 2003 8.10502 2004 8.5835 2005 8.29737 2006 8.05429 2007 7.70495 2008 7.20727 2009 7.0766 2010 6.79676 2011 6.75775 2012 6.13767 2013 6.84139 2014 5.95106 2015 6.03757 2016 6.16559 2017 5.43105 2018 5.71878 2019 5.45004 2020 5.91444 2021 5.02318 2022 4.83331