-9.28% is the change from 711 to 645
Calculation steps:
[( 645 - 711 ) ÷ 711] x 100 = -9.28%
Formula
Percentage change = [(645 - 711) / 711] x 100
Subtract the new number by the original number
645 - 711 = -66
-66 ÷ 711 = -0.09282700421940929
-0.09282700421940929 x 100 = -9.28%