| NBMBX | PMBMX | NBMBX / PMBMX | |
| Total Expense Ratio | 1.18 | 1.14 | 104% |
| Annual Report Gross Expense Ratio | 1.18 | 1.14 | 104% |
| Fund Existence | 29 years | 25 years | - |
| Gain YTD | 2.119 | -2.987 | -71% |
| Front Load | N/A | N/A | - |
| Min. Initial Investment | 0 | 0 | - |
| Min. Initial Investment IRA | N/A | N/A | - |
| Net Assets | 1.99B | 29.5B | 7% |
| Annual Yield % from dividends | 0.00 | 0.00 | - |
| Returns for 1 year | -17.69 | -11.84 | 149% |
| Returns for 3 years | 4.94 | 18.93 | 26% |
| Returns for 5 years | -31.05 | 9.56 | -325% |
| Returns for 10 years | 33.61 | 108.34 | 31% |