Task: Table-QA (source dataset: TableBench)

Task: 
You are given a table containing structured data and a natural language question referring to the table. Your goal is to analyze the table and provide an accurate and concise answer based on the given data.

Instructions:
1. Understand the Table: Examine the structure, headers, and data in the table. Identify relevant columns and rows related to the question.
2. Interpret the Question: Determine whether the question requires direct retrieval, aggregation, comparison, sorting, filtering, or inference.
3. Extract the Answer: Use logical reasoning and numerical operations (if necessary) to derive the correct response from the table.
4. Format the Answer: No explanation, return the answer in a structured JSON format: {"answer": <answer>}. If the question cannot be answered due to missing or ambiguous data, return a JSON response with {"answer": null}.

Table:
| administrative region                     |   population (2002 census data) |   surface km 2 | main rivers                                        |   average annual rainfall (mm) |   average annual runoff (mm) |   per capita average annual renewable water resources m 3 |
|:------------------------------------------|--------------------------------:|---------------:|:---------------------------------------------------|-------------------------------:|-----------------------------:|----------------------------------------------------------:|
| i - tarapacá                              |                          428594 |          58698 | azapa river , vítor river and camarones river      |                           93.6 |                          7.1 |                                                       972 |
| ii - antofagasta                          |                          493984 |         126444 | loa river                                          |                           44.5 |                          0.2 |                                                        51 |
| iii - atacama                             |                          254336 |          75573 | salado river                                       |                           82.4 |                          0.7 |                                                       208 |
| iv - coquimbo                             |                          603210 |          40656 | elqui river , choapa river and limarí river        |                          222   |                         18   |                                                      1213 |
| v - valparaíso                            |                         1539852 |          16396 | petorca river , la ligua river and aconcagua river |                          434   |                         84   |                                                       894 |
| metro region (mr) - santiago metropolitan |                         7003122 |          15349 | maipo river                                        |                          650   |                        200   |                                                       438 |
| vii - maule                               |                          908097 |          30325 | mataquito river and maule river                    |                         1377   |                        784   |                                                     26181 |
| viii - biobío                             |                         1861562 |          36929 | itata river , biobío river and laja river          |                         1766   |                       1173   |                                                     23270 |

Question:
How much greater is the average annual rainfall in the 'v - valparaíso' region compared to the 'ii - antofagasta' region?


id: 2e09024d7ebcee21c3bd33ae5f07e020
qtype: NumericalReasoning
label: 389.5