| 
 | β1 | β2 | β3 | 
| 2020-01 | 3.823 | −1.530 | −0.438 | 
| 2020-02 | 3.908 | −1.518 | −0.510 | 
| 2020-03 | 3.938 | −1.497 | −0.341 | 
| 2020-04 | 4.037 | −1.477 | −0.301 | 
| 2020-05 | 4.045 | −1.456 | −0.354 | 
| 2020-06 | 4.010 | −1.430 | −0.427 | 
| 2020-07 | 4.018 | −1.412 | −0.555 | 
| 2020-08 | 4.064 | −1.408 | −0.785 | 
| 2020-09 | 4.063 | −1.412 | −0.875 | 
| 2020-10 | 4.207 | −1.414 | −0.845 | 
| 2020-11 | 4.252 | −1.408 | −1.095 | 
| 2020-12 | 4.279 | −1.398 | −1.034 |