what is the change in fair value of foreign currency instruments from 2018 to 2019?
the table below presents the estimated maximum potential var arising from a one-day loss in fair value for our interest rate , foreign currency , commodity , and equity market-risk-sensitive instruments outstanding as of may 26 , 2019 and may 27 , 2018 , and the average fair value impact during the year ended may 26 , 2019. .

|  | Fair Value Impact |
| :--- | :--- |
| In Millions | May 26, 2019 | Averageduringfiscal 2019 | May 27, 2018 |
| Interest rate instruments | $74.4 | $46.1 | $33.2 |
| Foreign currency instruments | 16.8 | 19.0 | 21.3 |
| Commodity instruments | 4.1 | 2.5 | 1.9 |
| Equity instruments | 2.3 | 2.2 | 2.0 |

.

fair_value_impact = 16.8
answer = fair_value_impact - 21.3