-90.3% is the change from 938 to 91
Calculation steps:
[( 91 - 938 ) ÷ 938] x 100 = -90.3%
Formula
Percentage change = [(91 - 938) / 938] x 100
Subtract the new number by the original number
91 - 938 = -847
-847 ÷ 938 = -0.9029850746268657
-0.9029850746268657 x 100 = -90.3%