-0.17% is the change from 601 to 600
Calculation steps:
[( 600 - 601 ) ÷ 601] x 100 = -0.17%
Formula
Percentage change = [(600 - 601) / 601] x 100
Subtract the new number by the original number
600 - 601 = -1
-1 ÷ 601 = -0.0016638935108153079
-0.0016638935108153079 x 100 = -0.17%