| Year,Cases,Case fatality rate | |
| 1989,49123, | |
| 1990,68226, | |
| 1991,594932,3.23 | |
| 1992,461209,1.74 | |
| 1993,373879,1.8 | |
| 1994,384795,2.77 | |
| 1995,204678,2.4 | |
| 1996,144639,4.63 | |
| 1997,147368,4.24 | |
| 1998,292008,3.61 | |
| 1999,256530,3.61 | |
| 2000,136452,3.57 | |
| 2001,185575,1.46 | |
| 2002,141910,3.18 | |
| 2003,109162,1.68 | |
| 2004,100975,2.3 | |
| 2005,133723,1.7 | |
| 2006,237427,2.65 | |
| 2007,180117,2.26 | |
| 2008,191033,2.72 | |
| 2009,221053,2.22 | |
| 2010,316569,2.36 | |
| 2011,586745,1.35 | |
| 2012,245614,1.24 | |
| 2013,128265,1.63 | |
| 2014,188304,1.17 | |
| 2015,171930,0.77 | |
| 2016,130994,1.81 | |
| 2017,1225341,0.46 | |
| MIN,0,0 | |
| MAX,1400000,5 | |