Year Cases per 100,000 1990 28.91 1991 29.53 1992 30.19 1993 30.86 1994 31.42 1995 31.87 1996 32.07 1997 32.26 1998 32.71 1999 33.24 2000 33.73 2001 34.29 2002 34.74 2003 34.96 2004 35.36 2005 35.87 2006 36.01 2007 36.09 2008 36.25 2009 36.23 2010 36.52 2011 36.6 2012 37.01 2013 37.38 2014 37.54 2015 37.38 2016 37.2