-91.36% is the change from 243 to 21
Calculation steps:
[( 21 - 243 ) ÷ 243] x 100 = -91.36%
Formula
Percentage change = [(21 - 243) / 243] x 100
Subtract the new number by the original number
21 - 243 = -222
-222 ÷ 243 = -0.9135802469135802
-0.9135802469135802 x 100 = -91.36%