-89.49% is the change from 609 to 64
Calculation steps:
[( 64 - 609 ) ÷ 609] x 100 = -89.49%
Formula
Percentage change = [(64 - 609) / 609] x 100
Subtract the new number by the original number
64 - 609 = -545
-545 ÷ 609 = -0.8949096880131363
-0.8949096880131363 x 100 = -89.49%