-99.7% is the change from 662 to 2
Calculation steps:
[( 2 - 662 ) ÷ 662] x 100 = -99.7%
Formula
Percentage change = [(2 - 662) / 662] x 100
Subtract the new number by the original number
2 - 662 = -660
-660 ÷ 662 = -0.9969788519637462
-0.9969788519637462 x 100 = -99.7%