Year Cases per 100,000 1990 21.44 1991 21.94 1992 22.49 1993 23.07 1994 23.68 1995 24.34 1996 25.19 1997 26.1 1998 27.07 1999 28.09 2000 29.19 2001 30.2 2002 31.27 2003 32.4 2004 33.6 2005 34.88 2006 35.34 2007 35.79 2008 36.27 2009 36.76 2010 37.29 2011 37.61 2012 37.97 2013 38.33 2014 38.69 2015 39.07 2016 39.47