-50.22% is the change from 671 to 334
Calculation steps:
[( 334 - 671 ) ÷ 671] x 100 = -50.22%
Formula
Percentage change = [(334 - 671) / 671] x 100
Subtract the new number by the original number
334 - 671 = -337
-337 ÷ 671 = -0.5022354694485842
-0.5022354694485842 x 100 = -50.22%