Year Cases per 100,000 1990 35.87 1991 35.99 1992 36.13 1993 36.27 1994 36.42 1995 36.58 1996 36.53 1997 36.5 1998 36.47 1999 36.44 2000 36.43 2001 36.28 2002 36.16 2003 36.03 2004 35.91 2005 35.81 2006 35.79 2007 35.74 2008 35.72 2009 35.7 2010 35.7 2011 35.68 2012 35.67 2013 35.66 2014 35.66 2015 35.65 2016 35.67