-19.97% is the change from 671 to 537
Calculation steps:
[( 537 - 671 ) ÷ 671] x 100 = -19.97%
Formula
Percentage change = [(537 - 671) / 671] x 100
Subtract the new number by the original number
537 - 671 = -134
-134 ÷ 671 = -0.19970193740685543
-0.19970193740685543 x 100 = -19.97%