-31.1% is the change from 611 to 421
Calculation steps:
[( 421 - 611 ) ÷ 611] x 100 = -31.1%
Formula
Percentage change = [(421 - 611) / 611] x 100
Subtract the new number by the original number
421 - 611 = -190
-190 ÷ 611 = -0.3109656301145663
-0.3109656301145663 x 100 = -31.1%