| NTIAX | VIEIX | NTIAX / VIEIX | |
| Total Expense Ratio | 0.45 | 0.05 | 900% |
| Annual Report Gross Expense Ratio | 0.58 | 0.05 | 1,160% |
| Fund Existence | 25 years | 28 years | - |
| Gain YTD | 3.062 | 10.788 | 28% |
| Front Load | N/A | N/A | - |
| Min. Initial Investment | 2000 | 5000000 | 0% |
| Min. Initial Investment IRA | N/A | N/A | - |
| Net Assets | 2.51B | 83.9B | 3% |
| Annual Yield % from dividends | 1.03 | 1.09 | 94% |
| Returns for 1 year | -8.02 | 5.73 | -140% |
| Returns for 3 years | 6.30 | 48.62 | 13% |
| Returns for 5 years | -0.72 | 47.81 | -2% |
| Returns for 10 years | 7.73 | 157.78 | 5% |