Year Percent 1990 0 1995 1.01708 1996 3.30335 1997 4.83106 1998 6.28474 1999 7.67104 2000 8.99628 2001 12.91777 2002 15.32988 2003 19.595 2004 29.7156 2005 36.46639 2006 42.18635 2007 44.68 2008 46 2009 49 2010 53 2011 56 2012 60.27307 2013 64.5 2014 68.77 2015 71.2 2016 90