Year Percent 1990 0 1995 0.03678 1996 0.04371 1997 0.171 1998 0.30125 1999 0.57358 2000 1.20386 2001 1.41528 2002 2.5974 2003 4.8 2004 5.6 2005 6.5 2006 7.8 2007 9.4 2008 9.6 2009 9.8 2010 11.09 2011 15.9 2012 18.12 2013 17.8 2014 19.08 2015 27.61981 2016 30