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This is roughly what the graph looks like if you change the axis to be % change year over year: http://imgur.com/a/H6T5d

Could you do a chart with cumulative change over those years?

Is this what you're looking for? http://imgur.com/a/IGJ2h

It's stacked, not cumulative. Cumulative would be two cumulative running sums (for beer and pot) from the beginning of the period.