Figure 2 is a line graph showing trends in vaccination coverage estimates for individual vaccines at 12 months of age (DTPa, polio, Hib, hepatitis B, 7-valent pneumococcal, and rotavirus) in Australia from 1999 to 2011. · DTPa and polio coverage at 12 months of age remained relatively stable from the latter part of 2001 until 2011. Coverage for the Hib and hepatitis B vaccines at 12 months of age (prior to the change in algorithm to measure coverage that occurred in the latter half of 2009) are becoming similar to those for DTPa and polio in the last two cohorts of 2009 and all of 2010 and 2011. Coverage for PCV rose steadily from below 90% in mid-2007 to be just below that for all other vaccines due at this age at around 91%, except for rotavirus vaccine. Rotavirus vaccine coverage rose steeply from late 2008 from below 70% to almost 84% in late 2011