| Native Speakers | Language | % Correct |
|---|---|---|
| 155 mil | Russian | 97%
|
| 19 mil | Serbo-Croatian | 93%
|
| 40 mil | Polish | 87%
|
| 5.5 mil | Slovak | 86%
|
| 30 mil | Ukrainian | 86%
|
| 10 mil | Czech | 82%
|
| 9 mil | Bulgarian | 81%
|
| 2.1 mil | Slovenian | 79%
|
| 7.6 mil | Belarusian | 77%
|
| 2 mil | Macedonian | 63%
|