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Correlation with oil would improve the fit after 1950; before then Canada was not a producer, we were entirely a consumer. Alberta production did not start in force until the 1950's and the Oil Sands have taken even longer to bring online. The same with offshore Atlantic oil, there has been drilling since the 1970's (Ocean Ranger anyone?) but commercial production did not start until the 1990's with Hibernia.

The slow downward trend since 1960 may have something to do with economies of scale.

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