-72.07% is the change from 820 to 229
Calculation steps:
[( 229 - 820 ) ÷ 820] x 100 = -72.07%
Formula
Percentage change = [(229 - 820) / 820] x 100
Subtract the new number by the original number
229 - 820 = -591
-591 ÷ 820 = -0.7207317073170731
-0.7207317073170731 x 100 = -72.07%