-20.59% is the change from 646 to 513
Calculation steps:
[( 513 - 646 ) ÷ 646] x 100 = -20.59%
Formula
Percentage change = [(513 - 646) / 646] x 100
Subtract the new number by the original number
513 - 646 = -133
-133 ÷ 646 = -0.20588235294117646
-0.20588235294117646 x 100 = -20.59%