question_text: How many more people, in terms of percentage, were in the 2nd and 3rd largest age groups combined compared to the largest?
decomposition: return percentage of people in  the  2nd largest  age group ;return percentage of people in  the  3rd largest  age group ;return percentage of people in  the  largest  age group ;return the  sum of #1 and  #2 ;return the  difference of #4 and  #3