-34.51% is the change from 820 to 537
Calculation steps:
[( 537 - 820 ) ÷ 820] x 100 = -34.51%
Formula
Percentage change = [(537 - 820) / 820] x 100
Subtract the new number by the original number
537 - 820 = -283
-283 ÷ 820 = -0.34512195121951217
-0.34512195121951217 x 100 = -34.51%