-34.34% is the change from 990 to 650
Calculation steps:
[( 650 - 990 ) ÷ 990] x 100 = -34.34%
Formula
Percentage change = [(650 - 990) / 990] x 100
Subtract the new number by the original number
650 - 990 = -340
-340 ÷ 990 = -0.3434343434343434
-0.3434343434343434 x 100 = -34.34%