-64.58% is the change from 991 to 351
Calculation steps:
[( 351 - 991 ) ÷ 991] x 100 = -64.58%
Formula
Percentage change = [(351 - 991) / 991] x 100
Subtract the new number by the original number
351 - 991 = -640
-640 ÷ 991 = -0.6458123107971746
-0.6458123107971746 x 100 = -64.58%