-69.92% is the change from 645 to 194
Calculation steps:
[( 194 - 645 ) ÷ 645] x 100 = -69.92%
Formula
Percentage change = [(194 - 645) / 645] x 100
Subtract the new number by the original number
194 - 645 = -451
-451 ÷ 645 = -0.6992248062015504
-0.6992248062015504 x 100 = -69.92%