The graph shows the petroleum reserves that remain in five regions of europe. arrange

The graph shows the petroleum reserves that remain in five regions of europe. arrange the regions by decreasing amount of petroleum reserves.
petroleum reserves in europe
1,20,000-
1,00,000
remaining petroleum reserves
80,000
petroleum reserves
(millions of barrels of oil equivalent)
60,000
40,000
20,000
4,017 4,025 4,035 4,036 4,047
region a
region b
region d
region e
regions
a
.