_id	age__end_of_academic_year_	No of Pupils
1	3	1
2	4	204
3	5	459
4	6	1026
5	7	1365
6	8	1294
7	9	1211
8	10	1136
9	11	1078
10	12	1001
11	13	673
12	14	820
13	15	842
14	16	785
15	17	661
16	18	470
17	19	282
18	20	73
19	Unkown	971
20	Total	14,352