| 时间 | CI | 变化率 | 时间 | CI | 变化率 |
| 1987 | 2.355 | -- | 2007 | 3.448 | 3.66% |
| 1990 | 2.586 | 9.80% | 2010 | 3.511 | 1.84% |
| 1992 | 2.938 | 13.63% | 2012 | 3.417 | −2.67% |
| 1995 | 2.982 | 1.51% | 2015 | 3.591 | 5.09% |
| 1997 | 3.013 | 1.03% | 2017 | 3.142 | −12.53% |
| 2000 | 3.148 | 4.46% | 2018 | 3.102 | −1.273% |
| 2002 | 2.905 | −7.70% | 2020 | 3.058 | −1.418% |
| 2005 | 3.326 | 14.50% |
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