Year Cases per 100,000 1990 36.02 1991 36.22 1992 36.37 1993 36.48 1994 36.61 1995 36.9 1996 37.11 1997 37.54 1998 37.92 1999 38.24 2000 38.57 2001 38.91 2002 39.2 2003 39.44 2004 39.56 2005 39.71 2006 39.7 2007 39.59 2008 39.31 2009 38.97 2010 38.62 2011 38.23 2012 37.72 2013 37.28 2014 36.77 2015 36.25 2016 35.78