-50.52% is the change from 667 to 330
Calculation steps:
[( 330 - 667 ) ÷ 667] x 100 = -50.52%
Formula
Percentage change = [(330 - 667) / 667] x 100
Subtract the new number by the original number
330 - 667 = -337
-337 ÷ 667 = -0.5052473763118441
-0.5052473763118441 x 100 = -50.52%