-34.62% is the change from 988 to 646
Calculation steps:
[( 646 - 988 ) ÷ 988] x 100 = -34.62%
Formula
Percentage change = [(646 - 988) / 988] x 100
Subtract the new number by the original number
646 - 988 = -342
-342 ÷ 988 = -0.34615384615384615
-0.34615384615384615 x 100 = -34.62%