-8.53% is the change from 668 to 611
Calculation steps:
[( 611 - 668 ) ÷ 668] x 100 = -8.53%
Formula
Percentage change = [(611 - 668) / 668] x 100
Subtract the new number by the original number
611 - 668 = -57
-57 ÷ 668 = -0.08532934131736528
-0.08532934131736528 x 100 = -8.53%