-1.5% is the change from 600 to 591
Calculation steps:
[( 591 - 600 ) ÷ 600] x 100 = -1.5%
Formula
Percentage change = [(591 - 600) / 600] x 100
Subtract the new number by the original number
591 - 600 = -9
-9 ÷ 600 = -0.015
-0.015 x 100 = -1.5%
Example