-20.12% is the change from 671 to 536
Calculation steps:
[( 536 - 671 ) ÷ 671] x 100 = -20.12%
Formula
Percentage change = [(536 - 671) / 671] x 100
Subtract the new number by the original number
536 - 671 = -135
-135 ÷ 671 = -0.20119225037257824
-0.20119225037257824 x 100 = -20.12%