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+Development of ozone depletion over the years
+=============================================
+
+Chemical ozone depletion is not a quantity that can be measured
+directly.  Ozone is also influenced by atmospheric transport. The time
+at which the polar vortex breaks down varies from year to year.  One
+way to deduce the effect of chemical ozone depletion from the
+measurements is tto look at of the average ozone column in the polar
+vortex ("equivalent latitude" >63°). This quantity increases
+after the breakdown of the polar vortex (typically in March) due to
+the the transport of ozone-rich air masses towards the pole.
+Therefore the minimum of this quantity in March is an approximate measure
+of chemical ozone depletion in the Arctic. Here you can see this
+value for years up to and including 2019 and also the corresponding
+time series for Antarctica.