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Fig. 5 Scatterplot shows percentage of change month-to-month using
rolling average data seen in Figure
4. Note three clear inflections points: June 1992, when the
percentage of change switches from positive to negative; December 1995, when
the percentage of change switches back from negative to positive; and March
2002, when the percentage of change switches to being negative after hovering
around zero for about a year. Further data are required to assess whether
December 2004 represents a true inflection point or a temporary blip.