-67.12% is the change from 660 to 217
Calculation steps:
[( 217 - 660 ) ÷ 660] x 100 = -67.12%
Formula
Percentage change = [(217 - 660) / 660] x 100
Subtract the new number by the original number
217 - 660 = -443
-443 ÷ 660 = -0.6712121212121213
-0.6712121212121213 x 100 = -67.12%