| 年份范围 | 1992~2008 | 1992~2011 |
| c0 | 0.0033468696 | 0.0039541444 |
| c1 | 0.0068373910 | 0.0061011089 |
| c2 | −0.0023273574 | −0.0020700253 |
| c3 | 0.0002745210 | 0.0002381611 |
| c4 | −0.0000137707 | −0.0000115564 |
| c5 | 0.0000002504 | 0.0000002021 |
| R2 | 0.93 | 0.94 |