100
80
60
40
20
0
O
S
A
J
J
M
A
M
F
J
2014
2015
D
N
O
Dollars per barrel
100
80
60
40
20
0
O
S
A
J
J
M
A
M
F
J
2014
2015
D
N
O
Dollars per barrel
100
80
60
40
20
0
O
S
A
J
J
M
A
M
F
J
2014
2015
D
N
O
Dollars per barrel
100
80
60
40
20
0
Oct
Sep
Aug
Jul
Jun
May
Apr
Mar
Feb
Jan
2014
2015
Dec
Nov
Oct
Dollars per barrel