-23.41% is the change from 645 to 494
Calculation steps:
[( 494 - 645 ) ÷ 645] x 100 = -23.41%
Formula
Percentage change = [(494 - 645) / 645] x 100
Subtract the new number by the original number
494 - 645 = -151
-151 ÷ 645 = -0.23410852713178296
-0.23410852713178296 x 100 = -23.41%