Year Cases per 100,000 1990 32.37 1991 32.85 1992 33.35 1993 33.87 1994 34.39 1995 34.96 1996 34.87 1997 34.81 1998 34.76 1999 34.72 2000 34.69 2001 34.74 2002 34.79 2003 34.85 2004 34.91 2005 34.97 2006 35.3 2007 35.63 2008 35.96 2009 36.3 2010 36.65 2011 37.06 2012 37.48 2013 37.9 2014 38.34 2015 38.78 2016 39.23