Australian Divorce Rate over the past 100 years


I was struck by the parallel pattern of the US divorce rate and Australian divorce rate over the past 100 years.  In both countries the rate was increasing slightly before World War II (1940-45), then increases sharply for a few years following the war, and finally spikes in the late 1970s before declining for the past 30 years.

These patterns suggest that the factors that were driving the divorce rate were present in at least two countries.