-19.86% is the change from 428 to 343
Calculation steps:
[( 343 - 428 ) ÷ 428] x 100 = -19.86%
Formula
Percentage change = [(343 - 428) / 428] x 100
Subtract the new number by the original number
343 - 428 = -85
-85 ÷ 428 = -0.1985981308411215
-0.1985981308411215 x 100 = -19.86%