It is mostly due to ATSAP, the self reporting program that went into effect between 2009 and 2010 across the country. The report says that there is an actual increase in errors, not just the reporting, but I don't think that's accurate. There is better technology now at smaller FAA facilities for detecting losses of separation than there was in 2008. With that said, there is a lot less experience in the FAA then there was 5 years ago, and is definitely going to get worse.