-29.74% is the change from 918 to 645
Calculation steps:
[( 645 - 918 ) ÷ 918] x 100 = -29.74%
Formula
Percentage change = [(645 - 918) / 918] x 100
Subtract the new number by the original number
645 - 918 = -273
-273 ÷ 918 = -0.2973856209150327
-0.2973856209150327 x 100 = -29.74%