-91.3% is the change from 839 to 73
Calculation steps:
[( 73 - 839 ) ÷ 839] x 100 = -91.3%
Formula
Percentage change = [(73 - 839) / 839] x 100
Subtract the new number by the original number
73 - 839 = -766
-766 ÷ 839 = -0.9129916567342073
-0.9129916567342073 x 100 = -91.3%