-29.63% is the change from 243 to 171
Calculation steps:
[( 171 - 243 ) ÷ 243] x 100 = -29.63%
Formula
Percentage change = [(171 - 243) / 243] x 100
Subtract the new number by the original number
171 - 243 = -72
-72 ÷ 243 = -0.2962962962962963
-0.2962962962962963 x 100 = -29.63%