2010 :: £40 million budget cap and 13 teams:
http://www.formula1.com/news/headlines/2009/4/9290.html
this is interesting:
A new Costs Commission will monitor and enforce the budget-cap regulations. Those teams accepting the cap will be able to run constantly adjustable wings, engines with no rev limit, more powerful KERS systems, and - in theory - four-wheel drive. They will also be allowed unlimited out-of-season track testing with no restrictions on the scale and speed of wind tunnel testing.
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