-33.77% is the change from 998 to 661
Calculation steps:
[( 661 - 998 ) ÷ 998] x 100 = -33.77%
Formula
Percentage change = [(661 - 998) / 998] x 100
Subtract the new number by the original number
661 - 998 = -337
-337 ÷ 998 = -0.3376753507014028
-0.3376753507014028 x 100 = -33.77%