-1.64% is the change from 428 to 421
Calculation steps:
[( 421 - 428 ) ÷ 428] x 100 = -1.64%
Formula
Percentage change = [(421 - 428) / 428] x 100
Subtract the new number by the original number
421 - 428 = -7
-7 ÷ 428 = -0.016355140186915886
-0.016355140186915886 x 100 = -1.64%