-67.31% is the change from 991 to 324
Calculation steps:
[( 324 - 991 ) ÷ 991] x 100 = -67.31%
Formula
Percentage change = [(324 - 991) / 991] x 100
Subtract the new number by the original number
324 - 991 = -667
-667 ÷ 991 = -0.6730575176589304
-0.6730575176589304 x 100 = -67.31%