| United States Treasury Bonds 4.75%
| - | 4.20% | - | - | 248,373,000 |
| United States Treasury Bonds 4.75%
| - | 4.14% | - | - | 245,510,000 |
| United States Treasury Bonds 4.75%
| - | 4.09% | - | - | 245,631,000 |
| United States Treasury Bonds 4.625%
| - | 4.06% | - | - | 245,669,000 |
| United States Treasury Bonds 4.625%
| - | 4.01% | - | - | 245,524,000 |
| United States Treasury Bonds 4.625%
| - | 4.01% | - | - | 245,682,000 |
| United States Treasury Bonds 4.5%
| - | 3.93% | - | - | 245,696,000 |
| United States Treasury Bonds 4.75%
| - | 3.90% | - | - | 234,152,000 |
| United States Treasury Bonds 4.25%
| - | 3.81% | - | - | 245,703,000 |
| United States Treasury Bonds 4.25%
| - | 3.81% | - | - | 245,655,000 |