| United States Treasury Bonds 4.75%
| - | 4.20% | - | - | 248,777,000 |
| United States Treasury Bonds 4.75%
| - | 4.14% | - | - | 245,746,000 |
| United States Treasury Bonds 4.75%
| - | 4.09% | - | - | 245,867,000 |
| United States Treasury Bonds 4.625%
| - | 4.06% | - | - | 245,905,000 |
| United States Treasury Bonds 4.625%
| - | 4.01% | - | - | 245,760,000 |
| United States Treasury Bonds 4.625%
| - | 4.01% | - | - | 245,918,000 |
| United States Treasury Bonds 4.5%
| - | 3.93% | - | - | 245,932,000 |
| United States Treasury Bonds 4.75%
| - | 3.89% | - | - | 234,176,000 |
| United States Treasury Bonds 4.25%
| - | 3.81% | - | - | 245,939,000 |
| United States Treasury Bonds 4.25%
| - | 3.81% | - | - | 245,891,000 |