Instruct: What is the Pine Rivers total population after 1947 with a Redcliffe population smaller than 68,877, a total population greater than 50,785, and a Caboolture population greater than 12,207?
Output: SELECT COUNT (Pine Rivers) FROM table WHERE Year > 1947 AND (Redcliffe) < 68,877 AND Population (Total) > 50,785 AND (Caboolture) > 12,207