Percentage of the world population speaks fluent English?
The estimated number of people in the world that speak English fluently is about 30 percent of the population. If the world's population is about 7,264,712,400 people. This would mean that roughly 2,179,413,720 people in the world currently speak English fluently.
I couldn't find any official statistics. But English has been taught as a mandatory foreign language in Norwegian primary school since the 1960s, so close to 100% of the population below age 60 or so will know at least some English. Before the 1960s, English was taught in secondary school. According to Wikipedia, 89% of the population of Sweden speaks English. I assume the percentage for Norway is about the same.
It's hard to say, but since Lithuania was occupied by the Soviet Union, citizens had to use Russian. Therefore, almost every citizen of Lithuania who is in his thirties or older speaks Russian. The new generation however, mainly speaks in English (as well as Lithuanian of course). My estimate is 60%-80%