-0.48% is the change from 210 to 209
Calculation steps:
[( 209 - 210 ) ÷ 210] x 100 = -0.48%
Formula
Percentage change = [(209 - 210) / 210] x 100
Subtract the new number by the original number
209 - 210 = -1
-1 ÷ 210 = -0.004761904761904762
-0.004761904761904762 x 100 = -0.48%