-20.59% is the change from 306 to 243
Calculation steps:
[( 243 - 306 ) ÷ 306] x 100 = -20.59%
Formula
Percentage change = [(243 - 306) / 306] x 100
Subtract the new number by the original number
243 - 306 = -63
-63 ÷ 306 = -0.20588235294117646
-0.20588235294117646 x 100 = -20.59%