-63.47% is the change from 271 to 99
Calculation steps:
[( 99 - 271 ) ÷ 271] x 100 = -63.47%
Formula
Percentage change = [(99 - 271) / 271] x 100
Subtract the new number by the original number
99 - 271 = -172
-172 ÷ 271 = -0.6346863468634686
-0.6346863468634686 x 100 = -63.47%