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