-78.91% is the change from 991 to 209
Calculation steps:
[( 209 - 991 ) ÷ 991] x 100 = -78.91%
Formula
Percentage change = [(209 - 991) / 991] x 100
Subtract the new number by the original number
209 - 991 = -782
-782 ÷ 991 = -0.7891019172552977
-0.7891019172552977 x 100 = -78.91%