Rank thresholds

Just as I start typing this I am getting a feeling that google might be my friend here, but I am in work and don't have unfettered access to google results.

I understand that there is a set amount of Exploration sales/Bounties/trading profit which triggers each rank change, with reasonably small individual variations depending on other factors. Does any kind CMDR have a good source for the rank thresholds in each of the three professions? What are they?
 
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