-30.24% is the change from 916 to 639
Calculation steps:
[( 639 - 916 ) ÷ 916] x 100 = -30.24%
Formula
Percentage change = [(639 - 916) / 916] x 100
Subtract the new number by the original number
639 - 916 = -277
-277 ÷ 916 = -0.30240174672489084
-0.30240174672489084 x 100 = -30.24%