Read the following texts and table with financial data from an S&P 500 earnings report carefully.Based on the question-answer history (if provided), answer the last question. The answer may require mathematical calculation based on the data provided.


2018 ppg annual report and form 10-k 59 other acquisitions in 2018 , 2017 , and 2016 , the company completed several smaller business acquisitions . the total consideration paid for these acquisitions , net of cash acquired , debt assumed and other post closing adjustments , was $ 108 million , $ 74 million and $ 43 million , respectively . in january 2018 , ppg acquired procoatings , a leading architectural paint and coatings wholesaler located in the netherlands . procoatings , established in 2001 , distributes a large portfolio of well-known professional paint brands through its network of 23 multi-brand stores . the company employs nearly 100 people . the results of this business since the date of acquisition have been reported within the architectural coatings americas and asia pacific business within the performance coatings reportable segment . in january 2017 , ppg acquired certain assets of automotive refinish coatings company futian xinshi ( 201cfutian 201d ) , based in the guangdong province of china . futian distributes its products in china through a network of more than 200 distributors . in january 2017 , ppg completed the acquisition of deutek s.a. , a leading romanian paint and architectural coatings manufacturer , from the emerging europe accession fund . deutek , established in 1993 , manufactures and markets a large portfolio of well-known professional and consumer paint brands , including oskar and danke! . the company 2019s products are sold in more than 120 do-it-yourself stores and 3500 independent retail outlets in romania . divestitures glass segment in 2017 , ppg completed a multi-year strategic shift in the company's business portfolio , resulting in the exit of all glass operations which consisted of the global fiber glass business , ppg's ownership interest in two asian fiber glass joint ventures and the flat glass business . accordingly , the results of operations , including the gains on the divestitures , and cash flows have been recast as discontinued operations for all periods presented . ppg now has two reportable business segments . the net sales and income from discontinued operations related to the former glass segment for the three years ended december 31 , 2018 , 2017 , and 2016 were as follows: . <table class='wikitable'><tr><td>1</td><td>( $ in millions )</td><td>2018</td><td>2017</td><td>2016</td></tr><tr><td>2</td><td>net sales</td><td>$ 2014</td><td>$ 217</td><td>$ 908</td></tr><tr><td>3</td><td>income from operations</td><td>$ 21</td><td>$ 30</td><td>$ 111</td></tr><tr><td>4</td><td>net gains on the divestitures of businesses</td><td>2014</td><td>343</td><td>421</td></tr><tr><td>5</td><td>income tax expense</td><td>5</td><td>140</td><td>202</td></tr><tr><td>6</td><td>income from discontinued operations net of tax</td><td>$ 16</td><td>$ 233</td><td>$ 330</td></tr></table> during 2018 , ppg released $ 13 million of previously recorded accruals and contingencies established in conjunction with the divestitures of businesses within the former glass segment as a result of completed actions , new information and updated estimates . also during 2018 , ppg made a final payment of $ 20 million to vitro s.a.b . de c.v related to the transfer of certain pension obligations upon the sale of the former flat glass business . north american fiber glass business on september 1 , 2017 , ppg completed the sale of its north american fiber glass business to nippon electric glass co . ltd . ( 201cneg 201d ) . cash proceeds from the sale were $ 541 million , resulting in a pre-tax gain of $ 343 million , net of certain accruals and contingencies established in conjunction with the divestiture . ppg 2019s fiber glass operations included manufacturing facilities in chester , south carolina , and lexington and shelby , north carolina ; and administrative and research-and-development operations in shelby and in harmar , pennsylvania , near pittsburgh . the business , which employed more than 1000 people and had net sales of approximately $ 350 million in 2016 , supplies the transportation , energy , infrastructure and consumer markets . flat glass business in october 2016 , ppg completed the sale of its flat glass manufacturing and glass coatings operations to vitro s.a.b . de c.v . ppg received approximately $ 740 million in cash proceeds and recorded a pre-tax gain of $ 421 million on the sale . under the terms of the agreement , ppg divested its entire flat glass manufacturing and glass coatings operations , including production sites located in fresno , california ; salem , oregon ; carlisle , pennsylvania ; and wichita falls , texas ; four distribution/fabrication facilities located across canada ; and a research-and-development center located in harmar , pennsylvania . ppg 2019s flat glass business included approximately 1200 employees . the business manufactures glass that is fabricated into products used primarily in commercial and residential construction . notes to the consolidated financial statements .
Question: what was the operating income return on sales in 2016?
Answer: 111.0
Question: and what is this return as a portion of the total net sales in that year?
Answer: 0.12225
Question: and in the year of 2015, what was this portion representation of that return on sales?

0.13825