-89.2% is the change from 611 to 66
Calculation steps:
[( 66 - 611 ) ÷ 611] x 100 = -89.2%
Formula
Percentage change = [(66 - 611) / 611] x 100
Subtract the new number by the original number
66 - 611 = -545
-545 ÷ 611 = -0.8919803600654664
-0.8919803600654664 x 100 = -89.2%