Year Cases per 100,000 1990 37.59 1991 37.66 1992 37.82 1993 38.04 1994 38.13 1995 38.27 1996 37.63 1997 37.16 1998 36.66 1999 36.4 2000 36.22 2001 36.15 2002 36.06 2003 35.72 2004 35.36 2005 35.35 2006 34.75 2007 34.13 2008 33.44 2009 33.11 2010 32.95 2011 33.2 2012 33.54 2013 33.79 2014 33.9 2015 33.97 2016 34.1