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:
| Member countries | Population | Area (km²) | GDP (billion US$) | GDP per capita (US$) |
| --- | --- | --- | --- | --- |
| Austria | 8206524.0 | 83871.0 | 145.238 | 18048.0 |
| Finland | 5261008.0 | 338145.0 | 80.955 | 15859.0 |
| Sweden | 9047752.0 | 449964.0 | 156.640 | 17644.0 |
| Accession countries | 22029977.0 | 871980.0 | 382.833 | 17378.0 |
| Existing members (1995) | 350909402.0 | 2495174.0 | 5,894.232 | 16797.0 |
Question:
What is the gdp of the country with an area of 83871 (km2)?
Answer:
145.238