-98.6% is the change from 215 to 3
Calculation steps:
[( 3 - 215 ) ÷ 215] x 100 = -98.6%
Formula
Percentage change = [(3 - 215) / 215] x 100
Subtract the new number by the original number
3 - 215 = -212
-212 ÷ 215 = -0.986046511627907
-0.986046511627907 x 100 = -98.6%