-91.6% is the change from 667 to 56
Calculation steps:
[( 56 - 667 ) ÷ 667] x 100 = -91.6%
Formula
Percentage change = [(56 - 667) / 667] x 100
Subtract the new number by the original number
56 - 667 = -611
-611 ÷ 667 = -0.9160419790104948
-0.9160419790104948 x 100 = -91.6%