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                                                         |   shares issued | treasury shares   |   shares outstanding |
|:-------------------------------------------------------------------|----------------:|:------------------|---------------------:|
| balance at january 3 2016                                          |            1214 | 2014              |                 1214 |
| exercise of stock options issuance of other stock awards and other |               5 | -2 ( 2 )          |                    3 |
| balance at december 31 2016                                        |            1219 | -2 ( 2 )          |                 1217 |
| exercise of stock options issuance of other stock awards and other |               2 | 2014              |                    2 |
| balance at december 30 2017                                        |            1221 | -2 ( 2 )          |                 1219 |
| exercise of stock options issuance of other stock awards and other |               3 | -2 ( 2 )          |                    1 |
| balance at december 29 2018                                        |            1224 | -4 ( 4 )          |                 1220 |

Question:
what is the net increase in outstanding shares during the period of 2016 to 2018 , in millions?


pre_text: debt issuance costs : debt issuance costs are reflected as a direct deduction of our long-term debt balance on the consolidated balance sheets .
we incurred debt issuance costs of $ 15 million in 2018 and $ 53 million in 2016 .
debt issuance costs in 2017 were insignificant .
unamortized debt issuance costs were $ 115 million at december 29 , 2018 , $ 114 million at december 30 , 2017 , and $ 124 million at december 31 , 2016 .
amortization of debt issuance costs was $ 16 million in 2018 , $ 16 million in 2017 , and $ 14 million in 2016 .
debt premium : unamortized debt premiums are presented on the consolidated balance sheets as a direct addition to the carrying amount of debt .
unamortized debt premium , net , was $ 430 million at december 29 , 2018 and $ 505 million at december 30 , 2017 .
amortization of our debt premium , net , was $ 65 million in 2018 , $ 81 million in 2017 , and $ 88 million in 2016 .
debt repayments : in july and august 2018 , we repaid $ 2.7 billion aggregate principal amount of senior notes that matured in the period .
we funded these long-term debt repayments primarily with proceeds from the new notes issued in june 2018 .
additionally , in june 2017 , we repaid $ 2.0 billion aggregate principal amount of senior notes that matured in the period .
we funded these long-term debt repayments primarily with cash on hand and our commercial paper programs .
fair value of debt : at december 29 , 2018 , the aggregate fair value of our total debt was $ 30.1 billion as compared with a carrying value of $ 31.2 billion .
at december 30 , 2017 , the aggregate fair value of our total debt was $ 33.0 billion as compared with a carrying value of $ 31.5 billion .
our short-term debt and commercial paper had carrying values that approximated their fair values at december 29 , 2018 and december 30 , 2017 .
we determined the fair value of our long-term debt using level 2 inputs .
fair values are generally estimated based on quoted market prices for identical or similar instruments .
note 20 .
capital stock preferred stock our second amended and restated certificate of incorporation authorizes the issuance of up to 920000 shares of preferred stock .
on june 7 , 2016 , we redeemed all 80000 outstanding shares of our series a preferred stock for $ 8.3 billion .
we funded this redemption primarily through the issuance of long-term debt in may 2016 , as well as other sources of liquidity , including our u.s .
commercial paper program , u.s .
securitization program , and cash on hand .
in connection with the redemption , all series a preferred stock was canceled and automatically retired .
common stock our second amended and restated certificate of incorporation authorizes the issuance of up to 5.0 billion shares of common stock .
shares of common stock issued , in treasury , and outstanding were ( in millions of shares ) : shares issued treasury shares shares outstanding .
post_text: .
label: 6
qa: answer: 6
ann_table_rows: 1
7
steps: op: minus2-1
arg1: 1220
arg2: 1214
res: 6
program: subtract(1220, 1214)
gold_inds: table_1: the balance at january 3 2016 of shares issued is 1214 ; the balance at january 3 2016 of treasury shares is 2014 ; the balance at january 3 2016 of shares outstanding is 1214 ;
table_7: the balance at december 29 2018 of shares issued is 1224 ; the balance at december 29 2018 of treasury shares is -4 ( 4 ) ; the balance at december 29 2018 of shares outstanding is 1220 ;
exe_ans: 6
tfidftopn: text_25: shares of common stock issued , in treasury , and outstanding were ( in millions of shares ) : shares issued treasury shares shares outstanding .
program_re: subtract(1220, 1214)
model_input: table_1
the balance at january 3 2016 of shares issued is 1214 ; the balance at january 3 2016 of treasury shares is 2014 ; the balance at january 3 2016 of shares outstanding is 1214 ;
table_3
the balance at december 31 2016 of shares issued is 1219 ; the balance at december 31 2016 of treasury shares is -2 ( 2 ) ; the balance at december 31 2016 of shares outstanding is 1217 ;
table_7
the balance at december 29 2018 of shares issued is 1224 ; the balance at december 29 2018 of treasury shares is -4 ( 4 ) ; the balance at december 29 2018 of shares outstanding is 1220 ;