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I don't understand, the graph that you linked too appears to demonstrate exactly the same effect that the OP graph is. Could you explain what was cherry picked?

Another point (perhaps not what the parent meant): the author pulls out computer science from the mid-80s peak.

See here: http://imgur.com/XUCku

If we look at the table[1] upon which the article bases its figure we see that the proportion of liberal arts degrees has been steadily around 38% since the 1970s. In addition, the same table reveals that business has held the plurality at around 20% for the entirety of that same period. Visual arts has gone from 4% to 6% in that same period.

[1]: http://nces.ed.gov/programs/digest/d10/tables/dt10_282.asp

Thank you for the additional information! That chart did seem somewhat limited.