% of the population that speaks fluent English:

🇨🇳 China - 0.5%
🇧🇷 Brazil - 5%
🇷🇺 Russia - 5%
🇦🇷 Argentina - 6.52%
🇮🇳 India - 10.5%
🇧🇩 Bangladesh - 12%
🇲🇽 Mexico - 12.9%
🇹🇷 Turkey - 17%
🇪🇸 Spain - 22%
🇿🇦 South Africa - 31%
🇮🇹 Italy - 34%
🇵🇰 Pakistan - 49~58%
🇬🇷 Greece - 51%
🇳🇬 Nigeria - 53~60%
🇩🇪 Germany - 56%
🇫🇷 France - 57%
🇵🇭 Philippines - 58%
🇧🇪 Belgium - 60%
🇦🇹 Austria - 73%
🇫🇮 Finland - 75%
🇨🇦 Canada - 83%
🇩🇰 Denmark - 86%
🇸🇪 Sweden - 89%
🇳🇴 Norway - 90%
🇦🇺 Australia - 92.8%
🇺🇸 USA - 95.5%
🇸🇬 Singapore - 96.43%
🇳🇿 New Zealand - 97.82%
🇬🇧 UK - 98.3%
🇮🇪 Ireland - 98.37%
🇧🇧 Barbados - 100%
🇬🇮 Gibraltar - 100%

According to Crystal, Eurobarometer, US Census Bureau, Census, Mikrozensus, British council and EF etc.