| NTIAX | VIEIX | NTIAX / VIEIX | |
| Total Expense Ratio | 0.45 | 0.04 | 1,125% |
| Annual Report Gross Expense Ratio | 0.58 | 0.04 | 1,450% |
| Fund Existence | 26 years | 29 years | - |
| Gain YTD | 15.281 | 15.298 | 100% |
| Front Load | N/A | N/A | - |
| Min. Initial Investment | 2000 | 5000000 | 0% |
| Min. Initial Investment IRA | N/A | N/A | - |
| Net Assets | 2.46B | 93.7B | 3% |
| Annual Yield % from dividends | 0.91 | 1.02 | 89% |
| Returns for 1 year | 20.39 | 28.27 | 72% |
| Returns for 3 years | 26.75 | 69.32 | 39% |
| Returns for 5 years | -4.28 | 28.96 | -15% |
| Returns for 10 years | 24.18 | 199.45 | 12% |