-99.7% is the change from 667 to 2
Calculation steps:
[( 2 - 667 ) ÷ 667] x 100 = -99.7%
Formula
Percentage change = [(2 - 667) / 667] x 100
Subtract the new number by the original number
2 - 667 = -665
-665 ÷ 667 = -0.9970014992503748
-0.9970014992503748 x 100 = -99.7%