Year Cases per 100,000 1990 14.8 1991 15.38 1992 15.99 1993 16.63 1994 17.3 1995 18 1996 18.96 1997 19.99 1998 21.08 1999 22.25 2000 23.49 2001 24.24 2002 25.04 2003 25.86 2004 26.71 2005 27.59 2006 28.3 2007 29.02 2008 29.77 2009 30.54 2010 31.34 2011 31.91 2012 32.51 2013 33.12 2014 33.74 2015 34.37 2016 35.03