Table:
|  | Notes | 2019 | 2018 | 2017 |
| --- | --- | --- | --- | --- |
| At 31 March Notes |  | £m | £m | £m |
| Derivative financial assets |  | 1,592 | 1,509 | 2,246 |
| Investments | 23 | 3,268 | 3,075 | 1,564 |
| Trade and other receivables a | 17 | 1,766 | 2,518 | 2,729 |
| Contract assets | 6 | 1,602 | – | – |
| Cash and cash equivalents | 24 | 1,666 | 528 | 528 |
|  |  | 9,894 | 7,630 | 7,067 |
Paragraphs:
Exposures The maximum credit risk exposure of the group’s financial assets at the balance sheet date is as follows:
The carrying amount excludes £445m (2017/18: £317m, 2016/17: £360m) of non-current trade and other receivables which relate to non-financial assets, and £1,456m (2017/18: £1,496m, 2016/17: £1,106m) of prepayments, deferred contract costs and other receivables.
Question:
What is the average investments for 2017 to 2019?
Answer: (3268 + 3075 + 1564) / 3 = 2635.67