-29.16% is the change from 902 to 639
Calculation steps:
[( 639 - 902 ) ÷ 902] x 100 = -29.16%
Formula
Percentage change = [(639 - 902) / 902] x 100
Subtract the new number by the original number
639 - 902 = -263
-263 ÷ 902 = -0.2915742793791574
-0.2915742793791574 x 100 = -29.16%