-90.48% is the change from 21 to 2
Calculation steps:
[( 2 - 21 ) ÷ 21] x 100 = -90.48%
Formula
Percentage change = [(2 - 21) / 21] x 100
Subtract the new number by the original number
2 - 21 = -19
-19 ÷ 21 = -0.9047619047619048
-0.9047619047619048 x 100 = -90.48%