On January 1, 2018, Zebra Corp. grants options that permit key executives to acquire 22 million of the company's $1 par common shares within the next 8 years, but not before December 31, 2021 (the vesting date). The exercise price is $27 per share. The fair value of the options, estimated by an appropriate option-pricing model, is $6 per option. Zebra Corp.'s policy is to estimate option forfeitures. Originally, a forfeiture rate of 4% was expected. During 2020, the third year, Zebra Corp. revised its estimate of forfeitures from 4% to 6%. Required: Prepare the appropriate journal entry to record compensation expense, considering expected forfeitures, in each of the following years. Please show all work for full credit.