-32.73% is the change from 987 to 664
Calculation steps:
[( 664 - 987 ) ÷ 987] x 100 = -32.73%
Formula
Percentage change = [(664 - 987) / 987] x 100
Subtract the new number by the original number
664 - 987 = -323
-323 ÷ 987 = -0.3272543059777102
-0.3272543059777102 x 100 = -32.73%