-9.9% is the change from 667 to 601
Calculation steps:
[( 601 - 667 ) ÷ 667] x 100 = -9.9%
Formula
Percentage change = [(601 - 667) / 667] x 100
Subtract the new number by the original number
601 - 667 = -66
-66 ÷ 667 = -0.09895052473763119
-0.09895052473763119 x 100 = -9.9%