No details but it appears from April 2009 thru Dec 2011 for California as a whole, refinances thru HARP were 9% of the volume.
In 2012/2013 it appears for California that it’s more 15-20% of total refinances were HARP and roughly 50% of those were >105% LTV. Some interesting tables in their report. I can’t seem to find the same report for the 2012/2013 time period.