Year Cases per 100,000 1990 36.54 1991 35.71 1992 34.92 1993 34.15 1994 33.41 1995 32.69 1996 33.25 1997 33.82 1998 34.41 1999 35.02 2000 35.65 2001 35.88 2002 36.11 2003 36.35 2004 36.6 2005 36.86 2006 37.24 2007 37.63 2008 38.03 2009 38.45 2010 38.88 2011 39.03 2012 39.18 2013 39.34 2014 39.5 2015 39.66 2016 39.84