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 )                               | 2010             | 2009           | 2008         |
|:------------------------------------------------|:-----------------|:---------------|:-------------|
| net sales                                       | $ 318.5          | $ 634.9        | $ 735.4      |
| earnings from operations                        | $ 3.5            | $ 19.6         | $ 18.2       |
| gain on sale of business                        | 8.6              | 2212           | 2212         |
| loss on asset impairment                        | -107.1 ( 107.1 ) | 2212           | 2212         |
| loss on business consolidation activities ( a ) | -10.4 ( 10.4 )   | -23.1 ( 23.1 ) | -8.3 ( 8.3 ) |
| gain on disposition                             | 2212             | 4.3            | 2212         |
| tax benefit ( provision )                       | 30.5             | -3.0 ( 3.0 )   | -5.3 ( 5.3 ) |
| discontinued operations net of tax              | $ -74.9 ( 74.9 ) | $ -2.2 ( 2.2 ) | $ 4.6        |

Question:
what was the percentage change in net sales for the discontinued operations between 2009 and 2010?


pre_text: page 22 of 100 in addition to worldview-3 , some of the segment 2019s other high-profile contracts include : the james webb space telescope , a successor to the hubble space telescope ; the joint polar satellite system , the next-generation satellite weather monitoring system ; the global precipitation measurement-microwave imager , which will play an essential role in the earth 2019s weather and environmental forecasting ; and a number of antennas and sensors for the joint strike fighter .
segment earnings in 2010 as compared to 2009 increased by $ 8.4 million due to favorable fixed-price program performance and higher sales , partially offset by the program reductions described above .
segment earnings in 2009 were down $ 14.8 million compared to 2008 , primarily attributable to the winding down of several large programs and overall reduced program activity .
on february 15 , 2008 , ball completed the sale of its shares in bsg to qinetiq pty ltd for approximately $ 10.5 million , including cash sold of $ 1.8 million .
the subsidiary provided services to the australian department of defense and related government agencies .
after an adjustment for working capital items , the sale resulted in a pretax gain of $ 7.1 million .
sales to the u.s .
government , either directly as a prime contractor or indirectly as a subcontractor , represented 96 percent of segment sales in 2010 , 94 percent in 2009 and 91 percent in 2008 .
contracted backlog for the aerospace and technologies segment at december 31 , 2010 and 2009 , was $ 989 million and $ 518 million , respectively .
the increase in backlog is primarily due to the awards of the worldview-3 and joint polar satellite system ( jpss ) contracts .
comparisons of backlog are not necessarily indicative of the trend of future operations .
discontinued operations 2013 plastic packaging , americas in august 2010 , we completed the sale of our plastics packaging business and received gross proceeds of $ 280 million .
this amount included $ 15 million of contingent consideration recognized at closing but did not include preliminary closing adjustments totaling $ 18.5 million paid in the fourth quarter .
the sale of our plastics packaging business included five u.s .
plants that manufactured polyethylene terephthalate ( pet ) bottles and preforms and polypropylene bottles , as well as associated customer contracts and other related assets .
our plastics business employed approximately 1000 people and had sales of $ 635 million in 2009 .
the manufacturing plants were located in ames , iowa ; batavia , illinois ; bellevue , ohio ; chino , california ; and delran , new jersey .
the research and development operations were based in broomfield and westminster , colorado .
the following table summarizes the operating results for the discontinued operations for the years ended december 31: .
post_text: ( a ) includes net charges recorded to reflect costs associated with the closure of plastics packaging manufacturing plants .
additional segment information for additional information regarding our segments , see the business segment information in note 2 accompanying the consolidated financial statements within item 8 of this report .
the charges recorded for business consolidation activities were based on estimates by ball management and were developed from information available at the time .
if actual outcomes vary from the estimates , the differences will be reflected in current period earnings in the consolidated statement of earnings and identified as business consolidation gains and losses .
additional details about our business consolidation activities and associated costs are provided in note 5 accompanying the consolidated financial statements within item 8 of this report. .
label: -0.49835
qa: answer: -50%
ann_table_rows: 1
steps: op: minus2-1
arg1: 318.5
arg2: 634.9
res: 316.4
op: divide2-2
arg1: #0
arg2: 634.9
res: -50%
program: subtract(318.5, 634.9), divide(#0, 634.9)
gold_inds: table_1: ( $ in millions ) the net sales of 2010 is $ 318.5 ; the net sales of 2009 is $ 634.9 ; the net sales of 2008 is $ 735.4 ;
exe_ans: -0.49835
tfidftopn: table_8: ( $ in millions ) The discontinued operations net of tax of 2010 is $ -74.9 ( 74.9 ) ; The discontinued operations net of tax of 2009 is $ -2.2 ( 2.2 ) ; The discontinued operations net of tax of 2008 is $ 4.6 ;
text_6: sales to the u.s .
program_re: divide(subtract(318.5, 634.9), 634.9)
model_input: table_1
( $ in millions ) the net sales of 2010 is $ 318.5 ; the net sales of 2009 is $ 634.9 ; the net sales of 2008 is $ 735.4 ;
table_2
( $ in millions ) the earnings from operations of 2010 is $ 3.5 ; the earnings from operations of 2009 is $ 19.6 ; the earnings from operations of 2008 is $ 18.2 ;
table_8
( $ in millions ) the discontinued operations net of tax of 2010 is $ -74.9 ( 74.9 ) ; the discontinued operations net of tax of 2009 is $ -2.2 ( 2.2 ) ; the discontinued operations net of tax of 2008 is $ 4.6 ;