In 1992, 62% of Tartarstan supported referendum for independence

On August 30, 1990, Tatarstan announced its sovereignty with the Declaration on the State Sovereignty of the Tatar Soviet Socialist Republic and in 1992 Tatarstan held a referendum on the new constitution, and 62 percent of those who took part voted in favor of the constitution. In the 1992 Tatarstan Constitution, Tatarstan is defined as a Sovereign State. However the referendum and constitution were declared unconstitutional by the Russian Constitutional Court.

http://en.wikipedia.org/wiki/Tatarstan