-87.36% is the change from 609 to 77
Calculation steps:
[( 77 - 609 ) ÷ 609] x 100 = -87.36%
Formula
Percentage change = [(77 - 609) / 609] x 100
Subtract the new number by the original number
77 - 609 = -532
-532 ÷ 609 = -0.8735632183908046
-0.8735632183908046 x 100 = -87.36%