Mean monthly total ozone data obtained at South Pole, Antarctica, during 1964--1985 are presented. Preliminary analysis of the data suggests that total ozone has decreased at South Pole by roughly 20% since the mid-1960's. Largest decreases have occurred during October and November months, but autumn and winter months also exhibit a decrease. During February months, ozone has increased slightly. Superimposed on the long-term downward ozone trend are episodic decreases in ozone dating back to 1965 that have occurred at intervals of 4--6 years. These decreases are shown to be related to delays in stratospheric warmings in Antarctica and the transport of ozone into Antarctica each spring.