Task: Table-QA (source dataset: FinQA)

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:
| ( millions ) as of december 31       | 2007           | 2006             | 2005             |
|:-------------------------------------|:---------------|:-----------------|:-----------------|
| net derivative gains ( losses )      | $ 24           | $ 15             | $ -11 ( 11 )     |
| net unrealized investment gains      | 76             | 73               | 52               |
| net foreign exchange translation     | 284            | 118              | -119 ( 119 )     |
| postretirement plans                 | -1110 ( 1110 ) | -1216 ( 1216 )   | -1077 ( 1077 )   |
| accumulated other comprehensive loss | $ -726 ( 726 ) | $ -1010 ( 1010 ) | $ -1155 ( 1155 ) |

Question:
what are the average net unrealized investment gains for the period?


pre_text: notes to consolidated financial statements the components of accumulated other comprehensive loss , net of related tax , are as follows: .
post_text: aon corporation .
label: 67
qa: answer: 67
explanation: it is the sum of all net unrealized investment gains divided by three .
ann_table_rows: 2
steps: op: average2-1
arg1: net unrealized investment gains
arg2: none
res: 67
program: table_average(net unrealized investment gains, none)
gold_inds: table_2: ( millions ) as of december 31 the net unrealized investment gains of 2007 is 76 ; the net unrealized investment gains of 2006 is 73 ; the net unrealized investment gains of 2005 is 52 ;
exe_ans: 67
tfidftopn: table_1: ( millions ) as of december 31 The net derivative gains ( losses ) of 2007 is $ 24 ; The net derivative gains ( losses ) of 2006 is $ 15 ; The net derivative gains ( losses ) of 2005 is $ -11 ( 11 ) ;
table_3: ( millions ) as of december 31 The net foreign exchange translation of 2007 is 284 ; The net foreign exchange translation of 2006 is 118 ; The net foreign exchange translation of 2005 is -119 ( 119 ) ;
program_re: table_average(net unrealized investment gains, none)
model_input: text_0
notes to consolidated financial statements the components of accumulated other comprehensive loss , net of related tax , are as follows: .
table_1
( millions ) as of december 31 the net derivative gains ( losses ) of 2007 is $ 24 ; the net derivative gains ( losses ) of 2006 is $ 15 ; the net derivative gains ( losses ) of 2005 is $ -11 ( 11 ) ;
table_2
( millions ) as of december 31 the net unrealized investment gains of 2007 is 76 ; the net unrealized investment gains of 2006 is 73 ; the net unrealized investment gains of 2005 is 52 ;