_id	age__end_of_academic_year_	No of Pupils
1	3	6
2	4	166
3	5	480
4	6	1483
5	7	1834
6	8	1746
7	9	1657
8	10	1519
9	11	1457
10	12	1382
11	13	989
12	14	1066
13	15	1128
14	16	1212
15	17	972
16	18	752
17	19	398
18	20	84
19	Unkown	160
20	Total	18491