-0.99% is the change from 606 to 600
Calculation steps:
[( 600 - 606 ) ÷ 606] x 100 = -0.99%
Formula
Percentage change = [(600 - 606) / 606] x 100
Subtract the new number by the original number
600 - 606 = -6
-6 ÷ 606 = -0.009900990099009901
-0.009900990099009901 x 100 = -0.99%