-99.11% is the change from 671 to 6
Calculation steps:
[( 6 - 671 ) ÷ 671] x 100 = -99.11%
Formula
Percentage change = [(6 - 671) / 671] x 100
Subtract the new number by the original number
6 - 671 = -665
-665 ÷ 671 = -0.9910581222056631
-0.9910581222056631 x 100 = -99.11%