Among the 8 countries that gained the most in freedom (Chart 1), most of the gained happened between 1988 and 2000, which also included the collapse of the Soviet Union.1 A few of these countries were related to the former SU, but some were not.
Looking at the next two charts (Charts 2 and 3) indicate that for the most part the gains and losses in freedom were gradual, and in some cases didn't seem to follow any particular pattern. One other pattern was that after about 2000, there didn't seem to be any further gains in freedom, among those 14 countries that gained the most freedom over this time period.