Year Cases per 100,000 1990 36.68 1991 37.84 1992 39.05 1993 40.31 1994 41.62 1995 42.98 1996 42.52 1997 42.09 1998 41.66 1999 41.25 2000 40.85 2001 41.34 2002 41.84 2003 42.35 2004 42.86 2005 43.4 2006 44.2 2007 45.02 2008 45.86 2009 46.73 2010 47.62 2011 48.11 2012 48.62 2013 49.14 2014 49.66 2015 50.19 2016 50.73