-53.95% is the change from 671 to 309
Calculation steps:
[( 309 - 671 ) ÷ 671] x 100 = -53.95%
Formula
Percentage change = [(309 - 671) / 671] x 100
Subtract the new number by the original number
309 - 671 = -362
-362 ÷ 671 = -0.5394932935916542
-0.5394932935916542 x 100 = -53.95%