3.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
4.3
Nov 09
3.9
Feb 10
3.5
May 10
3.3
Aug 10
3.2
Nov 10
3.1
Feb 11
3.2
May 11
3.4
Aug 11
3.5
Nov 11
3.5
Feb 12
3.5
May 12
3.6
Aug 12
3.9
Nov 12
4.4
Feb 13
4.8
May 13
5.1
Aug 13
5.1
Nov 13
5.1
Feb 14
5.1
May 14
5.1
Aug 14
5.1
Nov 14
5.0
Feb 15
4.8
May 15
4.6
Aug 15
4.4
Nov 15
4.3
Feb 16
4.1
May 16
4.1
Aug 16
4.1
Nov 16
3.9
Feb 17
3.8
May 17
3.6
Aug 17
3.4
Nov 17
3.2
Feb 18
3.1
May 18
3.0
Aug 18
