-2.7% is the change from 667 to 649
Calculation steps:
[( 649 - 667 ) ÷ 667] x 100 = -2.7%
Formula
Percentage change = [(649 - 667) / 667] x 100
Subtract the new number by the original number
649 - 667 = -18
-18 ÷ 667 = -0.026986506746626688
-0.026986506746626688 x 100 = -2.7%