-99.52% is the change from 210 to 1
Calculation steps:
[( 1 - 210 ) ÷ 210] x 100 = -99.52%
Formula
Percentage change = [(1 - 210) / 210] x 100
Subtract the new number by the original number
1 - 210 = -209
-209 ÷ 210 = -0.9952380952380953
-0.9952380952380953 x 100 = -99.52%