U.S. property and casualty reserve releases have held steady over the past five years, but the composition of reserve development has shifted since 2008, with personal-lines releases increasing while commercial-lines releases have retreated, according to Moody's.

In a Special Comment, “U.S. P&C Insurers' Reserve Releases to Continue, but Remain Modest,” Moody's notes that commercial-lines reserve releases, excluding AIG, totaled $6 billion in 2008, more than any other sector. In 2012, commercial lines accounted for just over $1 billion, the lowest among the five sectors measured.

Personal lines, by contrast, accounted for just under $1.5 billion in 2008—second-lowest among the five sectors—but grew to just under $4.5 billion by 2012—the most among the five sectors.

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