-31.31% is the change from 99 to 68
Calculation steps:
[( 68 - 99 ) ÷ 99] x 100 = -31.31%
Formula
Percentage change = [(68 - 99) / 99] x 100
Subtract the new number by the original number
68 - 99 = -31
-31 ÷ 99 = -0.31313131313131315
-0.31313131313131315 x 100 = -31.31%