thousand
25
20
15
10
5
0
1998
2000
2005
2010
2015
2017
thousand
25
20
15
10
5
0
2000
2005
2010
2015
thousand
25
20
15
10
5
0
2000
2005
2010
2015
thousand
25
20
15
10
5
0
1998
2000
2005
2010
2015
2017
thousand
25
20
15
10
5
0
2000
2005
2010
2015
thousand
25
20
15
10
5
0
2000
2005
2010
2015