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| Percentage change | ||
| Year on year (4Q05-4Q06) | Trend (4Q06 provisional) | |
| Building cost index | 5.9 | Up |
| Mechanical cost index | 4.9 | Down |
| Electrical cost index | 5.5 | Steady |
| Consumer prices index | 2.7 | Up |
| The commodities exerting the greatest influence | ||
| Past 12 months % | Past 6 months % | |
| Electricity | 12% | 23% |
| Gas | -29% | 11% |
| Crude oils | -20% | -29% |
| Imported non-ferrous metals | 24% | -2% |
| Imported iron and steel | 17% | 7% |