| NTIAX | VIEIX | NTIAX / VIEIX | |
| Total Expense Ratio | 0.45 | 0.04 | 1,125% |
| Annual Report Gross Expense Ratio | 0.59 | 0.04 | 1,475% |
| Fund Existence | 26 years | 29 years | - |
| Gain YTD | 7.526 | 13.069 | 58% |
| Front Load | N/A | N/A | - |
| Min. Initial Investment | 2000 | 5000000 | 0% |
| Min. Initial Investment IRA | N/A | N/A | - |
| Net Assets | 2.38B | 95.3B | 2% |
| Annual Yield % from dividends | 0.94 | 1.01 | 92% |
| Returns for 1 year | 2.11 | 12.28 | 17% |
| Returns for 3 years | 15.06 | 59.79 | 25% |
| Returns for 5 years | -11.16 | 27.90 | -40% |
| Returns for 10 years | 11.02 | 175.87 | 6% |