In the following figures, smoothed is a seven day running average.





I tried fitting a cubic function to the cumulative points.
a = -6.08466e+06 +/- 9.886e+04 (1.625%) b = 1.62029e+08 +/- 8.283e+05 (0.5112%) c = -1.14925e+08 +/- 1.656e+06 (1.441%)
NOTE: I dropped the constant term I had been using to force the curve through (0,0).
Note - The next three graphs use a log scale.






