-21.99% is the change from 987 to 770
Calculation steps:
[( 770 - 987 ) ÷ 987] x 100 = -21.99%
Formula
Percentage change = [(770 - 987) / 987] x 100
Subtract the new number by the original number
770 - 987 = -217
-217 ÷ 987 = -0.2198581560283688
-0.2198581560283688 x 100 = -21.99%