Figure 4 is a line graph showing trends in vaccination coverage estimates for individual vaccines at 60 months of age (DTPa, polio, MMR) in Australia from 1999 to 2011. There was a marked increase in coverage for individual vaccines at 60 months of age following the change in the due/overdue rules in January 2009, with coverage increasing to levels similar to when coverage was assessed at 72 months of age. Coverage for all individual vaccines is at 90% in 2011.