| NBMTX | PMBMX | NBMTX / PMBMX | |
| Total Expense Ratio | 0.94 | 1.14 | 82% |
| Annual Report Gross Expense Ratio | 0.94 | 1.14 | 82% |
| Fund Existence | 32 years | 25 years | - |
| Gain YTD | -11.762 | -3.280 | 359% |
| Front Load | N/A | N/A | - |
| Min. Initial Investment | 0 | 0 | - |
| Min. Initial Investment IRA | N/A | N/A | - |
| Net Assets | 2B | 31.2B | 6% |
| Annual Yield % from dividends | 0.00 | 0.02 | - |
| Returns for 1 year | -14.88 | -5.21 | 286% |
| Returns for 3 years | 15.40 | 36.89 | 42% |
| Returns for 5 years | -26.19 | 16.99 | -154% |
| Returns for 10 years | 16.90 | 93.63 | 18% |