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:
| in millions              | december 31 2012   | december 31 2011   |
|:-------------------------|:-------------------|:-------------------|
| home equity loans/lines: |                    |                    |
| private investors ( a )  | $ 74               | $ 110              |

Question:
for home equity unresolved asserted indemnification and repurchase claims in millions , what was the change between december 31 2012 and december 31 2011?\\n\\n\\n\\n


pre_text: home equity repurchase obligations pnc 2019s repurchase obligations include obligations with respect to certain brokered home equity loans/lines that were sold to a limited number of private investors in the financial services industry by national city prior to our acquisition of national city .
pnc is no longer engaged in the brokered home equity lending business , and our exposure under these loan repurchase obligations is limited to repurchases of the loans sold in these transactions .
repurchase activity associated with brokered home equity lines/loans is reported in the non- strategic assets portfolio segment .
loan covenants and representations and warranties were established through loan sale agreements with various investors to provide assurance that loans pnc sold to the investors are of sufficient investment quality .
key aspects of such covenants and representations and warranties include the loan 2019s compliance with any applicable loan criteria established for the transaction , including underwriting standards , delivery of all required loan documents to the investor or its designated party , sufficient collateral valuation , and the validity of the lien securing the loan .
as a result of alleged breaches of these contractual obligations , investors may request pnc to indemnify them against losses on certain loans or to repurchase loans .
we investigate every investor claim on a loan by loan basis to determine the existence of a legitimate claim , and that all other conditions for indemnification or repurchase have been met prior to settlement with that investor .
indemnifications for loss or loan repurchases typically occur when , after review of the claim , we agree insufficient evidence exists to dispute the investor 2019s claim that a breach of a loan covenant and representation and warranty has occurred , such breach has not been cured , and the effect of such breach is deemed to have had a material and adverse effect on the value of the transferred loan .
depending on the sale agreement and upon proper notice from the investor , we typically respond to home equity indemnification and repurchase requests within 60 days , although final resolution of the claim may take a longer period of time .
most home equity sale agreements do not provide for penalties or other remedies if we do not respond timely to investor indemnification or repurchase requests .
investor indemnification or repurchase claims are typically settled on an individual loan basis through make-whole payments or loan repurchases ; however , on occasion we may negotiate pooled settlements with investors .
in connection with pooled settlements , we typically do not repurchase loans and the consummation of such transactions generally results in us no longer having indemnification and repurchase exposure with the investor in the transaction .
the following table details the unpaid principal balance of our unresolved home equity indemnification and repurchase claims at december 31 , 2012 and december 31 , 2011 , respectively .
table 31 : analysis of home equity unresolved asserted indemnification and repurchase claims in millions december 31 december 31 .
post_text: ( a ) activity relates to brokered home equity loans/lines sold through loan sale transactions which occurred during 2005-2007 .
the pnc financial services group , inc .
2013 form 10-k 81 .
label: -36
qa: answer: -36
ann_table_rows: 2
steps: op: minus1-1
arg1: 74
arg2: 110
res: -36
program: subtract(74, 110)
gold_inds: table_2: in millions the private investors ( a ) of december 31 2012 is $ 74 ; the private investors ( a ) of december 31 2011 is $ 110 ;
exe_ans: -36
tfidftopn: text_13: table 31 : analysis of home equity unresolved asserted indemnification and repurchase claims in millions december 31 december 31 .
table_1: in millions The home equity loans/lines: of december 31 2012 is ; The home equity loans/lines: of december 31 2011 is ;
program_re: subtract(74, 110)
model_input: text_12
the following table details the unpaid principal balance of our unresolved home equity indemnification and repurchase claims at december 31 , 2012 and december 31 , 2011 , respectively .
text_13
table 31 : analysis of home equity unresolved asserted indemnification and repurchase claims in millions december 31 december 31 .
table_1
in millions the home equity loans/lines: of december 31 2012 is ; the home equity loans/lines: of december 31 2011 is ;