Based on team rankings posted on the FiM site, (edit: added 2009 based on Wayne's
post)
In 2009 there were 132 FiM teams
In 2010 there were 136 FiM teams (added 4)
In 2011 there were 171 FiM teams (added 35)
In 2012 there were 190 FiM teams (added 19)
In 2013 there were 207 FiM teams (added 17)
In 2014 there were 277 FiM teams (added 70)

In 2015 there were 347 FiM teams (added 70)
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Based on
900 high schools in Michigan, progress toward the dream state is at 38.56% as of the 2015 FRC season.
__________________
Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)