-92.15% is the change from 650 to 51
Calculation steps:
[( 51 - 650 ) ÷ 650] x 100 = -92.15%
Formula
Percentage change = [(51 - 650) / 650] x 100
Subtract the new number by the original number
51 - 650 = -599
-599 ÷ 650 = -0.9215384615384615
-0.9215384615384615 x 100 = -92.15%