-2.5% is the change from 920 to 897
Calculation steps:
[( 897 - 920 ) ÷ 920] x 100 = -2.5%
Formula
Percentage change = [(897 - 920) / 920] x 100
Subtract the new number by the original number
897 - 920 = -23
-23 ÷ 920 = -0.025
-0.025 x 100 = -2.5%
Example