Year Cases per 100,000 1990 36.97 1991 36.88 1992 36.87 1993 36.87 1994 36.87 1995 36.79 1996 36.89 1997 36.91 1998 37.37 1999 37.82 2000 38.12 2001 37.64 2002 38.02 2003 38.11 2004 38.57 2005 37.9 2006 38.21 2007 38.33 2008 38.16 2009 38.27 2010 37.74 2011 37.16 2012 37.12 2013 36.82 2014 36.57 2015 36.32 2016 36.15