-29.88% is the change from 947 to 664
Calculation steps:
[( 664 - 947 ) ÷ 947] x 100 = -29.88%
Formula
Percentage change = [(664 - 947) / 947] x 100
Subtract the new number by the original number
664 - 947 = -283
-283 ÷ 947 = -0.2988384371700106
-0.2988384371700106 x 100 = -29.88%