-94.74% is the change from 646 to 34
Calculation steps:
[( 34 - 646 ) ÷ 646] x 100 = -94.74%
Formula
Percentage change = [(34 - 646) / 646] x 100
Subtract the new number by the original number
34 - 646 = -612
-612 ÷ 646 = -0.9473684210526315
-0.9473684210526315 x 100 = -94.74%