in 2018 what was the percent of the incentive compensation associated with charges for estimated awards to retirement-eligible employees
incentive compensation cost the following table shows components of compensation expense , relating to certain of the incentive compensation programs described above : in a0millions a0of a0dollars 2018 2017 2016 charges for estimated awards to retirement-eligible employees $ 669 $ 659 $ 555 amortization of deferred cash awards , deferred cash stock units and performance stock units 202 354 336 immediately vested stock award expense ( 1 ) 75 70 73 amortization of restricted and deferred stock awards ( 2 ) 435 474 509 .

| In millions of dollars | 2018 | 2017 | 2016 |
| :--- | :--- | :--- | :--- |
| Charges for estimated awards to retirement-eligible employees | $669 | $659 | $555 |
| Amortization of deferred cash awards, deferred cash stock units and performance stock units | 202 | 354 | 336 |
| Immediately vested stock award expense<sup>(1)</sup> | 75 | 70 | 73 |
| Amortization of restricted and deferred stock awards<sup>(2)</sup> | 435 | 474 | 509 |
| Other variable incentive compensation | 640 | 694 | 710 |
| Total | $2,021 | $2,251 | $2,183 |

( 1 ) represents expense for immediately vested stock awards that generally were stock payments in lieu of cash compensation . the expense is generally accrued as cash incentive compensation in the year prior to grant . ( 2 ) all periods include amortization expense for all unvested awards to non-retirement-eligible employees. .

compensation_2018 = 669
compensation_total = 2021
percent_compensation = compensation_2018 / compensation_total
answer = percent_compensation * 100