-67.03% is the change from 91 to 30
Calculation steps:
[( 30 - 91 ) ÷ 91] x 100 = -67.03%
Formula
Percentage change = [(30 - 91) / 91] x 100
Subtract the new number by the original number
30 - 91 = -61
-61 ÷ 91 = -0.6703296703296703
-0.6703296703296703 x 100 = -67.03%