CREATE TABLE table_11944 ("Year" FLOAT, "Award" TEXT, "Category" TEXT, "Nominee" TEXT, "Result" TEXT)

What year was there a Tony award category of Best Revival of a Musical?
SELECT "Year" FROM table_11944 WHERE "Award" = 'tony award' AND "Category" = 'best revival of a musical'
SELECT "Year" FROM "table_11944" WHERE "Award" = 'tony award' AND "Category" = 'best revival of a musical'