40% of NY's tax revenue comes from NYC. Add in the surrounding areas (Westchester, Long Island, etc.) and non-residents who commute and you get up to 82%.
Interesting, although the article is strangely silent on the subject of property taxes, which are extremely high in NY. NYC and surrounding areas undoubtedly have higher property values, so perhaps the ratio holds, but the rest of the state is very very big. It may also be that property taxes don't find their way to the state coffers, I'm honestly unsure.