-30.09% is the change from 914 to 639
Calculation steps:
[( 639 - 914 ) ÷ 914] x 100 = -30.09%
Formula
Percentage change = [(639 - 914) / 914] x 100
Subtract the new number by the original number
639 - 914 = -275
-275 ÷ 914 = -0.30087527352297594
-0.30087527352297594 x 100 = -30.09%