Parameter

1985-2001

2002-2016

Mean R

4.18

4.87

$\frac{\text{d}R}{R}$

0.0075

0.0219

Mean f₊

0.0469

0.0442

Mean f₋

0.0381

0.0199

${\sigma }_{f_{+}}$

0.0501

0.0642

${\sigma }_{f_{-}}$

0.0171

0.0219

${\rho }_{f_{+}{f}_{-}}$

0.6040***

0.1101