-9.1% is the change from 901 to 819
Calculation steps:
[( 819 - 901 ) ÷ 901] x 100 = -9.1%
Formula
Percentage change = [(819 - 901) / 901] x 100
Subtract the new number by the original number
819 - 901 = -82
-82 ÷ 901 = -0.09100998890122086
-0.09100998890122086 x 100 = -9.1%