Year Cases per 100,000 1990 26.18 1991 26.74 1992 27.35 1993 27.97 1994 28.63 1995 29.33 1996 30.15 1997 31.01 1998 31.92 1999 32.87 2000 33.88 2001 35.42 2002 37.08 2003 38.85 2004 40.76 2005 42.8 2006 43.5 2007 44.21 2008 44.95 2009 45.71 2010 46.5 2011 47.37 2012 48.28 2013 49.21 2014 50.17 2015 51.17 2016 52.21