-77.49% is the change from 915 to 206
Calculation steps:
[( 206 - 915 ) ÷ 915] x 100 = -77.49%
Formula
Percentage change = [(206 - 915) / 915] x 100
Subtract the new number by the original number
206 - 915 = -709
-709 ÷ 915 = -0.774863387978142
-0.774863387978142 x 100 = -77.49%