2

3

●

●

●

●

●

●

●

●

●

●

●

●

●

●

●

●

●

•

•

•

•

•

●

●

●

●

●

●

●

●

●

●

●

7

8

●

●

●

40

35

30

25

20

15

10

5

0

2015 2016 2017

11

●

●