Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| 1976 | 1977 | 1978 | 1979 | 1980 |
| --- | --- | --- | --- | --- |
| Chile | Chile | Chile | Chile | Chile |
| 487 | 566 | 713 | 951 | 1,128 |
| 3.5 | 3.5 | 4.1 | 4.6 | 5.2 |
| Argentina | Argentina | Argentina | Argentina | Argentina |
| 2,702 | 2,225 | 2,339 | 2,641 | 2,126 |
| 2.2 | 2.0 | 2.3 | 2.5 | 2.0 |
Question:
what is 1977 when 1978 is 4.1?
Answer:
3.5