Conventional prepayments increased 1% to 2% on average versus initial expectations of slowing around 10%. 

Specifically, 2005 and older vintages recorded the largest percentage increases at about 8%. Higher coupon 2008 vintages (6.5s and 7s) prepaid slightly faster in March versus February, while lower coupons were just modestly slower. The 2007 vintages slowed more in line with expectations of down 10%. 

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