-65.19% is the change from 991 to 345
Calculation steps:
[( 345 - 991 ) ÷ 991] x 100 = -65.19%
Formula
Percentage change = [(345 - 991) / 991] x 100
Subtract the new number by the original number
345 - 991 = -646
-646 ÷ 991 = -0.6518668012108981
-0.6518668012108981 x 100 = -65.19%