The number of records compromised in major data breaches dropped sharply last year. But the causes of those breaches changed dramatically, shifting strongly toward insider attacks. Those are just two of the conclusions revealed in a new study being issued today. The study was released by the U.S. Chamber of Commerce in New York City, New York, on Monday. It is the first time the report has been released that the number of major breaches in the past year has been publicly released in the United States.”]