| 国家定价 | 国家指导价 | 市场调节价 | |
| 1978 | 97% | 0% | 3% |
| 1985 | 47% | 19% | 34% |
| 1990 | 30% | 25% | 45% |
| 2006 | 4.63% | 0% | 95.37% |
| 2020 | 1.13% | 0.1% | 98.77% |
注：资料来源于国家统计局
