-35.26% is the change from 987 to 639
Calculation steps:
[( 639 - 987 ) ÷ 987] x 100 = -35.26%
Formula
Percentage change = [(639 - 987) / 987] x 100
Subtract the new number by the original number
639 - 987 = -348
-348 ÷ 987 = -0.3525835866261398
-0.3525835866261398 x 100 = -35.26%