Year Deaths per 100,000 1990 0 1991 0 1992 0 1993 0 1994 0 1995 0 1996 0.1 1997 0.1 1998 0.1 1999 0.2 2000 0.3 2001 0.5 2002 0.8 2003 1 2004 1.6 2005 2 2006 2.6 2007 3.1