No. of contaminated messages
Image: JISCmail logo
800000 
_
600000 
_
400000 
_
200000 
_
_
0
0
0
471
42
143
95
663
743
381
525
491
407
525
188
0
884
3141
1379
722
1972
2048
14724
4356
2279
7420
1208
1512
1240
1582
3802
1819
5584
7476
2567
1190
2273
65522
129252
94704
91556
176864
154754
62721
48956
39648
18671
62052
82291
58781
41160
70518
16576
42857
26810
18022
16853
16499
15270
72699
79297
14174
28547
25054
34330
31771
14213
12634
13435
27775
20336
351877
24788
403796
154664
348456
348451
732513
374238
519716
232529
226107
116513
203230
166234
561183
99242
269026
465612
709040
276777
235637
207133
142240
116139
105689
112524
18516
17431
16433
8531
8686
14006
15134
7591
7419
9189
16472
11972
25658
14435
19156
21023
24351
13172
26922
19697
10689
7894
8937
5369
5277
6484
5545
6176
9341
9879
7445
6252
7176
6674
7203
3896
4066
9239
4650
2811
5530
 

2000
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2001
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May
 
Note: Not available prior to March 2001