(c).
| Total cases | 1981–1990 | 1991–2000 | 2001–2011 | Total |
|---|---|---|---|---|
| Russia | 39 | 143 | 732 | 914 |
| Ukraine | 18 | 50 | 1151 | 1219 |
| Post-Soviet states | 1 | 3 | 17 | 21 |
| USSR | 58 | 196 | 1900 | 2154 |
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