Year Percent 1990 0 1995 0.00012 1996 0.00299 1997 0.02755 1998 0.04395 1999 0.05536 2001 1.31855 2002 2.57743 2003 5.04116 2004 6.16432 2005 6.33233 2006 6.5 2007 6.8 2008 7 2009 7.5 2010 8 2011 9 2012 9.96 2013 10.9 2014 12 2015 14 2016 15.51456