-49.32% is the change from 661 to 335
Calculation steps:
[( 335 - 661 ) ÷ 661] x 100 = -49.32%
Formula
Percentage change = [(335 - 661) / 661] x 100
Subtract the new number by the original number
335 - 661 = -326
-326 ÷ 661 = -0.49319213313161875
-0.49319213313161875 x 100 = -49.32%