-21.6% is the change from 537 to 421
Calculation steps:
[( 421 - 537 ) ÷ 537] x 100 = -21.6%
Formula
Percentage change = [(421 - 537) / 537] x 100
Subtract the new number by the original number
421 - 537 = -116
-116 ÷ 537 = -0.21601489757914338
-0.21601489757914338 x 100 = -21.6%