The rate of decrease of Total Column Ozone (TCO) over the Southern Hemisphere mid-latitudes (30-60°S) has diminished from the eighties to the nineties. In order to better understand this evolution, annual mean,January, June and October monthly means are analysed, both in latitude and longitude, and fitted with polynomial functions to describe their evolution. The results show significant different evolutions in longitude particularly south of 40°S, with areas of enhanced depletion and others with stable ozone levels or even recovery. The reasons for this decreasing trend, which considerably slowed down before the slowdown of chlorine loading, is discussed together with the evolution of the tropopshere and lower stratosphere. To do so, decadal differences for TCO, as well as for a set of tropospheric and stratospheric dynamic indicators, are carried out and compared. The results of the comparative study show that TCO decadal variations are in general more closely related to decadal dynamic changes during the nineties than during the eighties.