1.   He said oil price fluctuations affected the revenues of the oil-producing and exporting countries.

2.   The economy remains highly vulnerable to oil price fluctuations.

3.   As a result, oil still provides the bulk of their income and this has made their economies highly vulnerable to oil price fluctuations.

4.   This has made their economy highly vulnerable to oil price fluctuation and created persistent deficits in their budgets.

5.   Such reliance has made their economies vulnerable to oil price fluctuations.

6.   Such a reliance has made their economies highly vulnerable to oil price fluctuations.