-9.3% is the change from 710 to 644
Calculation steps:
[( 644 - 710 ) ÷ 710] x 100 = -9.3%
Formula
Percentage change = [(644 - 710) / 710] x 100
Subtract the new number by the original number
644 - 710 = -66
-66 ÷ 710 = -0.09295774647887324
-0.09295774647887324 x 100 = -9.3%