Foreign languages are not well taught in most Russian schools as well as colleges, universities etc. This percentage is only relatively high among people aged 30 and below, since it hardly made sense to learn languages before late 80s. I'd say about 5% of the population can understand English and 1% can speak it more or less fluently. Of course it's a rough estimate. The second most popular foreign language is German, I suppose. The third one is probably French. Though it does depend on the region. For instance, in St. Petersburg region the Finnish language is popular.