-77.16% is the change from 915 to 209
Calculation steps:
[( 209 - 915 ) ÷ 915] x 100 = -77.16%
Formula
Percentage change = [(209 - 915) / 915] x 100
Subtract the new number by the original number
209 - 915 = -706
-706 ÷ 915 = -0.7715846994535519
-0.7715846994535519 x 100 = -77.16%