-92.82% is the change from 209 to 15
Calculation steps:
[( 15 - 209 ) ÷ 209] x 100 = -92.82%
Formula
Percentage change = [(15 - 209) / 209] x 100
Subtract the new number by the original number
15 - 209 = -194
-194 ÷ 209 = -0.9282296650717703
-0.9282296650717703 x 100 = -92.82%