鉴于:
+-----------+---------------+-------------+-------+
| Name | Item | Year | Value |
+-----------+---------------+-------------+-------+
| Company A | Sales | 2017 | 100 |
| Company A | Sales | 2016 | 100 |
| Company A | Sales | 2015 | 400 |
| Company A | Profit | 2017 | 50 |
| Company A | Profit | 2016 | 50 |
| Company A | Profit | 2015 | 200 |
| Company B | Sales | 2017 | …