| Table 12: The Average Net Rates of Return on Highway Capital and Private Capital, and the Interest Rate | ||||
| Rates of Return | 1960-69 | 1970-79 | 1980-91 | 1960-91 |
| Highway Capital |
0.54 | 0.27 | 0.16 | 0.32 |
| Private Capital |
0.16 | 0.18 | 0.17 | 0.17 |
| Interest Rate |
0.05 | 0.08 | 0.10 | 0.08 |
| Table 13: Decomposition of Aggregate |
||||
| 1951-91 | 0.4737 | 0.2805 | -0.0074 | 0.1594 |
| 1951-60 | 0.6389 | 0.3968 | -0.0056 | 0.3491 |
| 1960-70 | 0.8781 | 0.6323 | 0.0067 | 0.2993 |
| 1970-80 | 0.1002 | 0.1847 | -0.0438 | 0.0707 |
| 1981-91 | 0.2955 | -0.0578 | 0.0112 | 0.0403 |