-34.95% is the change from 987 to 642
Calculation steps:
[( 642 - 987 ) ÷ 987] x 100 = -34.95%
Formula
Percentage change = [(642 - 987) / 987] x 100
Subtract the new number by the original number
642 - 987 = -345
-345 ÷ 987 = -0.3495440729483283
-0.3495440729483283 x 100 = -34.95%