-30.64% is the change from 927 to 643
Calculation steps:
[( 643 - 927 ) ÷ 927] x 100 = -30.64%
Formula
Percentage change = [(643 - 927) / 927] x 100
Subtract the new number by the original number
643 - 927 = -284
-284 ÷ 927 = -0.3063646170442287
-0.3063646170442287 x 100 = -30.64%