-90.91% is the change from 209 to 19
Calculation steps:
[( 19 - 209 ) ÷ 209] x 100 = -90.91%
Formula
Percentage change = [(19 - 209) / 209] x 100
Subtract the new number by the original number
19 - 209 = -190
-190 ÷ 209 = -0.9090909090909091
-0.9090909090909091 x 100 = -90.91%