I've seen no decline and believe the numbers are wrong and intended to fool the public into believing the problem is not as bad as many of us know it really is.
I haven’t seen any 13-15 strong Mexican households since I moved out of Ca 20 years ago.
I own a business in Santa Ana, Ca and spend every day there. By simple observation it is obvious that there is a significant decline in the illegal population. Even the 2010 census shows a major decline in the actual population of the city. What happened to these people? They went back to Mexico. It makes no sense to deny an obvious truth.