-50.53% is the change from 661 to 327
Calculation steps:
[( 327 - 661 ) ÷ 661] x 100 = -50.53%
Formula
Percentage change = [(327 - 661) / 661] x 100
Subtract the new number by the original number
327 - 661 = -334
-334 ÷ 661 = -0.5052950075642966
-0.5052950075642966 x 100 = -50.53%