| United States Treasury Bonds 4.75%
| - | 4.20% | - | - | 248,918,000 |
| United States Treasury Bonds 4.75%
| - | 4.14% | - | - | 245,812,000 |
| United States Treasury Bonds 4.75%
| - | 4.09% | - | - | 245,933,000 |
| United States Treasury Bonds 4.625%
| - | 4.06% | - | - | 245,971,000 |
| United States Treasury Bonds 4.625%
| - | 4.01% | - | - | 245,826,000 |
| United States Treasury Bonds 4.625%
| - | 4.01% | - | - | 245,984,000 |
| United States Treasury Bonds 4.5%
| - | 3.93% | - | - | 245,998,000 |
| United States Treasury Bonds 4.75%
| - | 3.89% | - | - | 234,149,000 |
| United States Treasury Bonds 4.25%
| - | 3.81% | - | - | 246,005,000 |
| United States Treasury Bonds 4.25%
| - | 3.81% | - | - | 245,957,000 |