-54.4% is the change from 671 to 306
Calculation steps:
[( 306 - 671 ) ÷ 671] x 100 = -54.4%
Formula
Percentage change = [(306 - 671) / 671] x 100
Subtract the new number by the original number
306 - 671 = -365
-365 ÷ 671 = -0.5439642324888226
-0.5439642324888226 x 100 = -54.4%