Another change in DTPa vaccine scheduling occurred in October 2009 when the pre-school booster dose of DTPa-polio was scheduled at 3.5–4 years instead of 4 years of age. Figure 17 shows that this change in schedule took longer to take effect with no jurisdiction giving the vaccine in great numbers at 3.5 to 4 years of age until November 2010. As at December 2014, more than 30% of children in three jurisdictions were receiving the dose at 3.5 to 4 years of age, in South Australia and the two Territories.