_id	age__end_of_academic_year_	No of Pupils
1	3	2
2	4	142
3	5	385
4	6	920
5	7	1120
6	8	1131
7	9	1059
8	10	989
9	11	959
10	12	810
11	13	602
12	14	630
13	15	675
14	16	629
15	17	488
16	18	465
17	19	241
18	20	53
19	Unkown	989
20	Total	12289