CREATE TABLE table_53877 ("Interregnum began" TEXT, "Interregnum ended" TEXT, "Duration" TEXT, "Count Palatine of Saxony" TEXT, "Count Palatine of the Rhine" TEXT)

What is the Interregnum ended for Count Palatine of Saxony of john george ii, elector of saxony?
SELECT "Interregnum ended" FROM table_53877 WHERE "Count Palatine of Saxony" = 'john george ii, elector of saxony'
SELECT "Interregnum ended" FROM "table_53877" WHERE "Count Palatine of Saxony" = 'john george ii, elector of saxony'