-30.49% is the change from 305 to 212
Calculation steps:
[( 212 - 305 ) ÷ 305] x 100 = -30.49%
Formula
Percentage change = [(212 - 305) / 305] x 100
Subtract the new number by the original number
212 - 305 = -93
-93 ÷ 305 = -0.30491803278688523
-0.30491803278688523 x 100 = -30.49%