The following table shows the daily receipts in millions of dollars of the movie "Avatar" for successive Fridays after its opening on Friday 18 December 2009.

Weeks	$Receipts
2	68.49
4	42.785
6	31.28
8	23.611
10	13.655
12	6.526
14	2.047
16	0.844
18	0.92
20	0.425
22	0.188
24	0.076
26	0.045
28	0.028

Estimate the instantaneous rate of change of daily receipts 22 weeks after the opening day.