This article is from the Ozone Depletion: Stratospheric Chlorine and Bromine FAQ, by Robert Parson email@example.com with numerous contributions by others.
Since the 1987 Montreal Protocol (see Part I) production of
CFC's and related compounds has been decreasing rapidly, and
in consequence their rate of growth in the atmosphere has
fallen dramatically [Elkins et al. 1993] [Prinn et al. 1995]
[Montzka et al. 1996] The data below show that CFC-12 concentrations
have nearly stabilized while CFC-11 has actually begun to decrease.
Growth Rate, pptv/yr Year CFC-12 CFC-11 1977-84 17 9 [Elkins et al. 1993] 1985-88 19.5 11 " 1993 10.5 2.7 " 1995 5.9 -0.6 [Montzka et al. 1996]