-16.41% is the change from 975 to 815
Calculation steps:
[( 815 - 975 ) ÷ 975] x 100 = -16.41%
Formula
Percentage change = [(815 - 975) / 975] x 100
Subtract the new number by the original number
815 - 975 = -160
-160 ÷ 975 = -0.1641025641025641
-0.1641025641025641 x 100 = -16.41%