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:
| Unnamed: 0           | notional value   | strike rate        | maturity   | fair value       |
|:---------------------|:-----------------|:-------------------|:-----------|:-----------------|
| interest rate collar | $ 70000          | 6.580% ( 6.580 % ) | 11/2004    | $ -4096 ( 4096 ) |
| interest rate swap   | $ 65000          | 4.010              | 8/2005     | $ 891            |

Question:
what was the average total revenue in 1999 , 2000 and 2001?


pre_text: 18 .
financial instruments : derivatives and hedging financial accounting standards board 2019s statement no .
133 , 201caccounting for derivative instruments and hedging activities , 201d ( 201csfas 133 201d ) which became effective january 1 , 2001 requires the company to recognize all derivatives on the balance sheet at fair value .
derivatives that are not hedges must be adjusted to fair value through income .
if a derivative is a hedge , depending on the nature of the hedge , changes in the fair value of the derivative will either be offset against the change in fair value of the hedged asset , liability , or firm commitment through earnings , or recognized in other comprehensive income until the hedged item is recognized in earnings .
the ineffective portion of a derivative 2019s change in fair value will be immediately recognized in earnings .
the company recorded a cumulative effect adjustment upon the adoption of sfas 133 .
this cumulative effect adjustment , of which the intrinsic value of the hedge was recorded in other comprehensive income ( $ 811 ) and the time value component was recorded in the state- ment of income ( $ 532 ) , was an unrealized loss of $ 1343 .
the transition amounts were determined based on the interpretive guidance issued by the fasb at that date .
the fasb continues to issue interpretive guidance that could require changes in the company 2019s application of the standard and adjustments to the transition amounts .
sfas 133 may increase or decrease reported net income and stockholders 2019 equity prospectively , depending on future levels of interest rates and other variables affecting the fair values of derivative instruments and hedged items , but will have no effect on cash flows .
the following table summarizes the notional and fair value of the company 2019s derivative financial instruments at december 31 , 2001 .
the notional is an indication of the extent of the company 2019s involvement in these instruments at that time , but does not represent exposure to credit , interest rate or market risks .
notional strike fair value rate maturity value .
post_text: on december 31 , 2001 , the derivative instruments were reported as an obligation at their fair value of $ 3205 .
offsetting adjustments are represented as deferred gains or losses in accumulated other comprehensive loss of $ 2911 .
currently , all derivative instruments are designated as hedging instruments .
over time , the unrealized gains and losses held in accumulated other comprehensive loss will be reclassified into earnings as interest expense in the same periods in which the hedged interest payments affect earnings .
the company estimates that approximately $ 1093 of the current balance held in accumulated other comprehensive loss will be reclassified into earnings within the next twelve months .
the company is not currently hedging exposure to variability in future cash flows for forecasted transactions other than anticipated future interest payments on existing debt .
19 .
environmental matters management of the company believes that the properties are in compliance in all material respects with applicable federal , state and local ordinances and regulations regarding environmental issues .
management is not aware of any environmental liability that it believes would have a materially adverse impact on the company 2019s financial position , results of operations or cash flows .
management is unaware of any instances in which it would incur significant environmental cost if any of the properties were sold .
20 .
segment information the company is a reit engaged in owning , managing , leasing and repositioning office properties in manhattan and has two reportable segments , office real estate and structured finance investments .
the company evaluates real estate performance and allocates resources based on net operating income .
the company 2019s real estate portfolio is located in one geo- graphical market of manhattan .
the primary sources of revenue are generated from tenant rents and escalations and reimburse- ment revenue .
real estate property operating expenses consist primarily of security , maintenance , utility costs , real estate taxes and ground rent expense ( at certain applicable properties ) .
at december 31 , 2001 and 2000 , of the total assets of $ 1371577 and $ 1161154 , $ 1182939 and $ 1109861 repre- sented real estate assets and $ 188638 and $ 51293 represented structured finance investments , respectively .
for the years ended december 31 , 2001 , 2000 and 1999 , of the total revenues of $ 257685 , $ 230323 and $ 206017 , $ 240316 , $ 217052 and $ 200751 represented total revenues from real estate assets and $ 17369 , $ 13271 and $ 5266 represented total revenues from structured finance investments .
for the years ended december 31 , 2001 , 2000 and 1999 , of the total net operating income of $ 63607 , $ 53152 and $ 48966 , $ 46238 , $ 39881 and $ 43700 represented net operat- ing income from real estate assets and $ 17369 , $ 13271 and $ 5266 represents net operating income from structured finance investments , respectively .
the company does not allocate mar- keting , general and administrative expenses or interest expense to the structured finance segment , since it bases performance on the individual segments prior to allocating marketing , general and administrative expenses and interest expense .
all other expenses relate solely to the real estate assets .
there were no transactions between the above two segments .
sl green realty corp .
notes to consolidated financial statements ( continued ) december 31 , 2001 ( dollars in thousands , except per share data ) .
label: 231341.66667
qa: answer: 231341.7
ann_text_rows: 30
steps: op: add2-1
arg1: 257685
arg2: 230323
res: 488008
op: add2-2
arg1: #0
arg2: 206017
res: 694025
op: divide2-3
arg1: #1
arg2: const_3
res: 231341.7
program: add(257685, 230323), add(#0, 206017), divide(#1, const_3)
gold_inds: text_30: at december 31 , 2001 and 2000 , of the total assets of $ 1371577 and $ 1161154 , $ 1182939 and $ 1109861 repre- sented real estate assets and $ 188638 and $ 51293 represented structured finance investments , respectively .
text_31: for the years ended december 31 , 2001 , 2000 and 1999 , of the total revenues of $ 257685 , $ 230323 and $ 206017 , $ 240316 , $ 217052 and $ 200751 represented total revenues from real estate assets and $ 17369 , $ 13271 and $ 5266 represented total revenues from structured finance investments .
exe_ans: 231341.66667
tfidftopn: text_28: the primary sources of revenue are generated from tenant rents and escalations and reimburse- ment revenue .
program_re: divide(add(add(257685, 230323), 206017), const_3)
model_input: text_30
at december 31 , 2001 and 2000 , of the total assets of $ 1371577 and $ 1161154 , $ 1182939 and $ 1109861 repre- sented real estate assets and $ 188638 and $ 51293 represented structured finance investments , respectively .
text_31
for the years ended december 31 , 2001 , 2000 and 1999 , of the total revenues of $ 257685 , $ 230323 and $ 206017 , $ 240316 , $ 217052 and $ 200751 represented total revenues from real estate assets and $ 17369 , $ 13271 and $ 5266 represented total revenues from structured finance investments .
text_32
for the years ended december 31 , 2001 , 2000 and 1999 , of the total net operating income of $ 63607 , $ 53152 and $ 48966 , $ 46238 , $ 39881 and $ 43700 represented net operat- ing income from real estate assets and $ 17369 , $ 13271 and $ 5266 represents net operating income from structured finance investments , respectively .