-93% is the change from 643 to 45
Calculation steps:
[( 45 - 643 ) ÷ 643] x 100 = -93%
Formula
Percentage change = [(45 - 643) / 643] x 100
Subtract the new number by the original number
45 - 643 = -598
-598 ÷ 643 = -0.9300155520995335
-0.9300155520995335 x 100 = -93%