-69.5% is the change from 646 to 197
Calculation steps:
[( 197 - 646 ) ÷ 646] x 100 = -69.5%
Formula
Percentage change = [(197 - 646) / 646] x 100
Subtract the new number by the original number
197 - 646 = -449
-449 ÷ 646 = -0.695046439628483
-0.695046439628483 x 100 = -69.5%