-19.23% is the change from 671 to 542
Calculation steps:
[( 542 - 671 ) ÷ 671] x 100 = -19.23%
Formula
Percentage change = [(542 - 671) / 671] x 100
Subtract the new number by the original number
542 - 671 = -129
-129 ÷ 671 = -0.19225037257824143
-0.19225037257824143 x 100 = -19.23%