-89.4% is the change from 915 to 97
Calculation steps:
[( 97 - 915 ) ÷ 915] x 100 = -89.4%
Formula
Percentage change = [(97 - 915) / 915] x 100
Subtract the new number by the original number
97 - 915 = -818
-818 ÷ 915 = -0.8939890710382513
-0.8939890710382513 x 100 = -89.4%