-31.08% is the change from 930 to 641
Calculation steps:
[( 641 - 930 ) ÷ 930] x 100 = -31.08%
Formula
Percentage change = [(641 - 930) / 930] x 100
Subtract the new number by the original number
641 - 930 = -289
-289 ÷ 930 = -0.310752688172043
-0.310752688172043 x 100 = -31.08%