-46.59% is the change from 646 to 345
Calculation steps:
[( 345 - 646 ) ÷ 646] x 100 = -46.59%
Formula
Percentage change = [(345 - 646) / 646] x 100
Subtract the new number by the original number
345 - 646 = -301
-301 ÷ 646 = -0.46594427244582043
-0.46594427244582043 x 100 = -46.59%