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                            | 2018   |   2017 |   2016 |
|:--------------------------------------|:-------|-------:|-------:|
| mandatory convertible preferred stock | n/a    |     39 |     39 |
| convertible notes                     | 2014   |     14 |     14 |
| stock options ( 1 )                   | 9      |     11 |     13 |
| stock awards                          | 2014   |      7 |      8 |

Question:
considering the average exercise price of options , what is the increase in the total value of stock options observed during 2016 and 2017 , in millions of dollars?


pre_text: the following shares were excluded from the calculation of average shares outstanding 2013 diluted as their effect was anti- dilutive ( shares in millions ) . .
post_text: ( 1 ) the average exercise price of options per share was $ 26.79 , $ 33.32 , and $ 26.93 for 2018 , 2017 , and 2016 , respectively .
in 2017 , had arconic generated sufficient net income , 30 million , 14 million , 5 million , and 1 million potential shares of common stock related to the mandatory convertible preferred stock , convertible notes , stock awards , and stock options , respectively , would have been included in diluted average shares outstanding .
the mandatory convertible preferred stock converted on october 2 , 2017 ( see note i ) .
in 2016 , had arconic generated sufficient net income , 28 million , 10 million , 4 million , and 1 million potential shares of common stock related to the mandatory convertible preferred stock , convertible notes , stock awards , and stock options , respectively , would have been included in diluted average shares outstanding. .
label: 16.43
qa: answer: 16.43
explanation: it is the difference between the average exercise price of options per share multiplied by the number of shares in 2016 and 2017 .
ann_table_rows: 3
ann_text_rows: 1
steps: op: multiply2-1
arg1: 11
arg2: 33.32
res: 366.52
op: multiply2-2
arg1: 13
arg2: 26.93
res: 350.09
op: minus2-3
arg1: #0
arg2: #1
res: 16.43
program: multiply(11, 33.32), multiply(13, 26.93), subtract(#0, #1)
gold_inds: table_3: the stock options ( 1 ) of 2018 is 9 ; the stock options ( 1 ) of 2017 is 11 ; the stock options ( 1 ) of 2016 is 13 ;
text_1: ( 1 ) the average exercise price of options per share was $ 26.79 , $ 33.32 , and $ 26.93 for 2018 , 2017 , and 2016 , respectively .
exe_ans: 16.43
tfidftopn: text_4: in 2016 , had arconic generated sufficient net income , 28 million , 10 million , 4 million , and 1 million potential shares of common stock related to the mandatory convertible preferred stock , convertible notes , stock awards , and stock options , respectively , would have been included in diluted average shares outstanding. .
program_re: subtract(multiply(11, 33.32), multiply(13, 26.93))
model_input: text_0
the following shares were excluded from the calculation of average shares outstanding 2013 diluted as their effect was anti- dilutive ( shares in millions ) . .
table_3
the stock options ( 1 ) of 2018 is 9 ; the stock options ( 1 ) of 2017 is 11 ; the stock options ( 1 ) of 2016 is 13 ;
text_1
( 1 ) the average exercise price of options per share was $ 26.79 , $ 33.32 , and $ 26.93 for 2018 , 2017 , and 2016 , respectively .