Someone has put together a set of links on Mondragon:
http://www.sfworlds.com/linkworld/mondragon.html
I'm sure the growth data is in there. Once I find it, I'll post it separately.
The book by William Whyte from Cornell is pretty good--'Making Mondragon'
The one by Sharyyn Kasmir--'The Myth of Mondragon' points out some of its cultural weaknesses.
Here's some growth data from ondragon's home site:
http://www.mondragon.mcc.es/ing/magnitudes/evolucion.html
One of their most impressive statistics is the success rate of new cooperatives. They have had very few failaures whereas the failure rate of capitalist small businesses is very high (70%?). This is a great increase in efficiency.
In regards to the general topic of this thread, to my knowledge, no worker owned business has ever voted to export its own jobs.