| 
                
            
            	| Purchases summarize all trades executed during the indicated period including purchases associated with dollar rolls.* |  
                     
                      | Transactions 
                        ($ million) |   
                      | 
                           
                            | Maturity | Coupon | Settlement 
                                Month | FHLMC | FNMA | GNMA | GNMA2 |  
                            | 30 Year | 3 | Sep | 190 | 142 | 0 | 228 |  
                            |  | 3.5 | Sep | 1,324 | 1,858 | 0 | 1,068 |  
                            |  | 4 | Sep | 597 | 1,017 | 0 | 420 |  
                            |  |  |  |  |  |  |  |  
                            | 15 Year | 2.5 | Sep | 104 | 148 | 0 | 0 |  
                            |  | 3 | Sep | 232 | 356 | 0 | 0 |  
                            |  |  |  |  |  |  |  |   
                            | Total |  |  | 2,447 | 3,521 | 0 | 1,716 |  
                          	| *Does not include trades associated with small value exercises. |  |  |