-96.09% is the change from 537 to 21
Calculation steps:
[( 21 - 537 ) ÷ 537] x 100 = -96.09%
Formula
Percentage change = [(21 - 537) / 537] x 100
Subtract the new number by the original number
21 - 537 = -516
-516 ÷ 537 = -0.9608938547486033
-0.9608938547486033 x 100 = -96.09%