| 
                
            
            	| 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 | 3.5 | Sep | 849 | 1,121 | 0 | 1,023 |  
                            |  | 3.5 | Oct | 328 | 403 | 0 | 326 |  
                            |  | 4 | Sep | 1,072 | 1,465 | 0 | 943 |  
                            |  | 4 | Oct | 328 | 419 | 0 | 315 |  
                            |  |  |  |  |  |  |  |  
                            | 15 Year | 2.5 | Sep | 0 | 52 | 0 | 0 |  
                            |  | 3 | Sep | 288 | 420 | 0 | 0 |  
                            |  | 3.5 | Sep | 51 | 105 | 0 | 0 |  
                            |  |  |  |  |  |  |  |   
                            | Total |  |  | 2,916 | 3,985 | 0 | 2,607 |  
                          	| *Does not include trades associated with small value exercises. |  |  |