How has the average Hollywood movie crew changed?

Hi,

In the past, I’ve looked at how big a movie crew can get, for both UK films and Hollywood movies. But I was recently asked by a reader how the composition of such crews has changed over time. Which departments are getting larger? Which jobs are on the rise and which are waning?

Please help.

I didn't find the right solution from the Internet.

References:
http://forums.cgsociety.org/showthread.php?f=2&t=1492963
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Thanks