-2.98% is the change from 671 to 651
Calculation steps:
[( 651 - 671 ) ÷ 671] x 100 = -2.98%
Formula
Percentage change = [(651 - 671) / 671] x 100
Subtract the new number by the original number
651 - 671 = -20
-20 ÷ 671 = -0.029806259314456036
-0.029806259314456036 x 100 = -2.98%