| Incidence Category |
≥20/100,000 |
15～/100,000 |
10～/100,000 |
5～/100,000 |
1～/100,000 |
0～/100,000 |
Total |
| 1989 |
27 |
13 |
18 |
20 |
3 |
8 |
89 |
| 1990 |
24 |
10 |
5 |
14 |
20 |
16 |
89 |
| 1991 |
16 |
3 |
11 |
18 |
20 |
21 |
89 |
| 1992 |
40 |
8 |
9 |
13 |
11 |
8 |
89 |
| 1993 |
49 |
3 |
9 |
10 |
16 |
2 |
89 |
| 1994 |
31 |
7 |
13 |
15 |
19 |
6 |
91 |
| 1995 |
12 |
2 |
8 |
18 |
31 |
20 |
91 |
| 1996 |
11 |
5 |
4 |
13 |
42 |
16 |
91 |
| 1997 |
16 |
8 |
9 |
28 |
30 |
19 |
110 |
| 1998 |
29 |
11 |
11 |
17 |
23 |
22 |
113 |
| 1999 |
14 |
5 |
9 |
19 |
32 |
34 |
113 |
| 2000 |
26 |
12 |
15 |
19 |
22 |
19 |
113 |
| 2001 |
29 |
7 |
11 |
15 |
31 |
20 |
113 |
| 2002 |
9 |
6 |
10 |
21 |
32 |
34 |
112 |
| 2003 |
5 |
7 |
10 |
15 |
37 |
37 |
111 |
| 2004 |
1 |
3 |
1 |
18 |
46 |
41 |
110 |
| 2005 |
4 |
3 |
2 |
14 |
37 |
50 |
110 |
| 2006 |
2 |
1 |
4 |
4 |
40 |
59 |
110 |
| 2007 |
1 |
0 |
0 |
7 |
39 |
64 |
111 |
* The total number of the counties was getting larger from 1997 for the county in suburb or near the city merged into the city and became urban counties. |
