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Million Barrels

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Year

154 '55 56 157 158 159 '60 '61 '62 163 '64 65 SOURCE: IPAA (Natural Gas Plants Excluded) (Alaska North Slope reserves not included.) Proved Reserves are as of the end of the year for which they are posted. Since data are published as of January 1, this means the data are posted for the year before that indicated by their published year.

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Millions of Dollara 5,

Millions of Barrels

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52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 SOURCE: Independent Petroleum Association of America (Alaska North Slope reserves not included.) Changes are from end of previous year to end of year posted.

Since data are published as of January 1, this means the changes are calculated by subtracting the posted years figure from that for the next year.

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Year (million barrels) (million dollars) (million dollars) (million dollars)

E and D Cost
Less Lease
Acquisitions

Expenditure Per Barrel (dollars)
With Lease Acq.
Without Lease Acq.

(3)/(2)

(5)/(2)

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