-16.44% is the change from 797 to 666
Calculation steps:
[( 666 - 797 ) ÷ 797] x 100 = -16.44%
Formula
Percentage change = [(666 - 797) / 797] x 100
Subtract the new number by the original number
666 - 797 = -131
-131 ÷ 797 = -0.164366373902133
-0.164366373902133 x 100 = -16.44%