-72.6% is the change from 73 to 20
Calculation steps:
[( 20 - 73 ) ÷ 73] x 100 = -72.6%
Formula
Percentage change = [(20 - 73) / 73] x 100
Subtract the new number by the original number
20 - 73 = -53
-53 ÷ 73 = -0.726027397260274
-0.726027397260274 x 100 = -72.6%