Year Cases per 100,000 1990 2.56 1991 2.56 1992 2.57 1993 2.57 1994 2.58 1995 2.59 1996 2.62 1997 2.64 1998 2.67 1999 2.68 2000 2.7 2001 2.72 2002 2.75 2003 2.77 2004 2.79 2005 2.82 2006 2.84 2007 2.85 2008 2.87 2009 2.88 2010 2.9 2011 2.92 2012 2.96 2013 2.99 2014 3.04 2015 3.08 2016 3.13