-91.14% is the change from 237 to 21
Calculation steps:
[( 21 - 237 ) ÷ 237] x 100 = -91.14%
Formula
Percentage change = [(21 - 237) / 237] x 100
Subtract the new number by the original number
21 - 237 = -216
-216 ÷ 237 = -0.9113924050632911
-0.9113924050632911 x 100 = -91.14%