-78.5% is the change from 307 to 66
Calculation steps:
[( 66 - 307 ) ÷ 307] x 100 = -78.5%
Formula
Percentage change = [(66 - 307) / 307] x 100
Subtract the new number by the original number
66 - 307 = -241
-241 ÷ 307 = -0.7850162866449512
-0.7850162866449512 x 100 = -78.5%