-30.2% is the change from 927 to 647
Calculation steps:
[( 647 - 927 ) ÷ 927] x 100 = -30.2%
Formula
Percentage change = [(647 - 927) / 927] x 100
Subtract the new number by the original number
647 - 927 = -280
-280 ÷ 927 = -0.30204962243797195
-0.30204962243797195 x 100 = -30.2%