| Variable | Obs | Mean | Std. Dev | Min | Max |
| tax | 30 | 52652.94 | 53294.08 | 2821.86 | 157992 |
| gdp | 30 | 312344.9 | 298592.4 | 18872.9 | 990865.1 |
| gnp | 30 | 311155.4 | 297780.7 | 18923.3 | 988528.9 |
| pfe | 30 | 69506.77 | 75434.56 | 3083.59 | 238874 |
| trs | 30 | 127054.9 | 127642.1 | 8300.1 | 411649 |
| tfa | 30 | 202002.3 | 227403.5 | 4517 | 645675 |
| ms | 30 | 182774.7 | 183326.1 | 6950.7 | 576000 |
| imp | 30 | 127711.7 | 107237.6 | 5560.12 | 315505 |