Year Cases per 100,000 1990 24.89 1991 24.89 1992 24.89 1993 24.9 1994 24.9 1995 24.92 1996 24.52 1997 24.13 1998 23.76 1999 23.39 2000 23.03 2001 23.4 2002 23.77 2003 24.16 2004 24.56 2005 24.97 2006 25.27 2007 25.56 2008 25.87 2009 26.18 2010 26.51 2011 27.04 2012 27.59 2013 28.16 2014 28.73 2015 29.32 2016 29.92