-89.89% is the change from 643 to 65
Calculation steps:
[( 65 - 643 ) ÷ 643] x 100 = -89.89%
Formula
Percentage change = [(65 - 643) / 643] x 100
Subtract the new number by the original number
65 - 643 = -578
-578 ÷ 643 = -0.8989113530326595
-0.8989113530326595 x 100 = -89.89%