-90.1% is the change from 919 to 91
Calculation steps:
[( 91 - 919 ) ÷ 919] x 100 = -90.1%
Formula
Percentage change = [(91 - 919) / 919] x 100
Subtract the new number by the original number
91 - 919 = -828
-828 ÷ 919 = -0.9009793253536452
-0.9009793253536452 x 100 = -90.1%