-30.17% is the change from 918 to 641
Calculation steps:
[( 641 - 918 ) ÷ 918] x 100 = -30.17%
Formula
Percentage change = [(641 - 918) / 918] x 100
Subtract the new number by the original number
641 - 918 = -277
-277 ÷ 918 = -0.3017429193899782
-0.3017429193899782 x 100 = -30.17%