As shown in the graphs, up until 1994, increasing amounts of chlorine and bromine were observed in the upper and lower atmosphere each year because of use of refrigerants, foam-blowing agents, chlorinated solvents, and fire retardants.  Since 1994, the amount of ozone-depleting chemicals in the lower atmosphere, or troposphere, has decreased as a result of overall adherence to international environmental legislation.
(reference: Montzka et al., [1996], Science, 272, 1318-1322, [May 31, 1996]).