Years

Females

Males

Total frequency

8

0

3

3

9

0

2

2

10

0

4

4

11

0

2

2

12

0

8

8

13

4

5

9

14

9

6

15

15

0

8

8

16

5

6

11

17

6

6

12

18

4

5

9

19

0

3

3

Total

28

58

86