Sept 29 (Reuters) - Fannie Mae
* Gross mortgage portfolio increased at a compound annualized rate of 9.1 percent in August
* The multifamily serious delinquency rate decreased one basis point to 0.07 percent in August
* Book of business increased at a compound annualized rate of 3.8 percent in August
* The conventional single-family serious delinquency rate decreased six basis points to 1.24 percent in August Source text for Eikon:
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