-47.6% is the change from 645 to 338
Calculation steps:
[( 338 - 645 ) ÷ 645] x 100 = -47.6%
Formula
Percentage change = [(338 - 645) / 645] x 100
Subtract the new number by the original number
338 - 645 = -307
-307 ÷ 645 = -0.475968992248062
-0.475968992248062 x 100 = -47.6%