-33.47% is the change from 998 to 664
Calculation steps:
[( 664 - 998 ) ÷ 998] x 100 = -33.47%
Formula
Percentage change = [(664 - 998) / 998] x 100
Subtract the new number by the original number
664 - 998 = -334
-334 ÷ 998 = -0.3346693386773547
-0.3346693386773547 x 100 = -33.47%