Year Cases per 100,000 1990 2.43 1991 2.43 1992 2.44 1993 2.45 1994 2.46 1995 2.47 1996 2.49 1997 2.5 1998 2.52 1999 2.52 2000 2.53 2001 2.52 2002 2.52 2003 2.52 2004 2.52 2005 2.53 2006 2.52 2007 2.52 2008 2.52 2009 2.53 2010 2.52 2011 2.54 2012 2.56 2013 2.58 2014 2.6 2015 2.63 2016 2.65