年份范围

1992~2008

1992~2011

C₀

0.9966690158

0.9960802178

C₁

−0.0067586000

−0.0060451212

C₂

0.0022993763

0.0020502011

C₃

−0.0002710117

−0.0002358350

C₄

0.0000135820

0.0000114418

C₅

−0.0000002467

−0.0000002001

R²

0.93

0.94