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Figure 2.2 shows the increase of APS 4, APS 5 and APS 6 as a percentage of 1996 numbers. All levels declined between 1996 and 1998 then increased with APS 4 having 180% in 2010. APS 5 having just over 120% in 2010 and APS 6 being 160% of 1996 numbers in 2