-66.95% is the change from 817 to 270
Calculation steps:
[( 270 - 817 ) ÷ 817] x 100 = -66.95%
Formula
Percentage change = [(270 - 817) / 817] x 100
Subtract the new number by the original number
270 - 817 = -547
-547 ÷ 817 = -0.6695226438188494
-0.6695226438188494 x 100 = -66.95%