-90.09% is the change from 212 to 21
Calculation steps:
[( 21 - 212 ) ÷ 212] x 100 = -90.09%
Formula
Percentage change = [(21 - 212) / 212] x 100
Subtract the new number by the original number
21 - 212 = -191
-191 ÷ 212 = -0.9009433962264151
-0.9009433962264151 x 100 = -90.09%