{"pre_text": ["other corporate special items in addition , other pre-tax corporate special items totaling $ 30 million , $ 0 million and $ 8 million were recorded in 2018 , 2017 and 2016 , respectively .", "details of these charges were as follows : other corporate items ."], "post_text": ["impairments of goodwill no goodwill impairment charges were recorded in 2018 , 2017 or 2016 .", "net losses on sales and impairments of businesses net losses on sales and impairments of businesses included in special items totaled a pre-tax loss of $ 122 million in 2018 related to the impairment of an intangible asset and fixed assets in the brazil packaging business , a pre-tax loss of $ 9 million in 2017 related to the write down of the long-lived assets of the company's asia foodservice business to fair value and a pre-tax loss of $ 70 million related to severance and the impairment of the ip asia packaging business in 2016 .", "see note 8 divestitures and impairments on pages 54 and 55 of item 8 .", "financial statements and supplementary data for further discussion .", "description of business segments international paper 2019s business segments discussed below are consistent with the internal structure used to manage these businesses .", "all segments are differentiated on a common product , common customer basis consistent with the business segmentation generally used in the forest products industry .", "industrial packaging international paper is the largest manufacturer of containerboard in the united states .", "our u.s .", "production capacity is over 13 million tons annually .", "our products include linerboard , medium , whitetop , recycled linerboard , recycled medium and saturating kraft .", "about 80% ( 80 % ) of our production is converted into corrugated boxes and other packaging by our 179 north american container plants .", "additionally , we recycle approximately one million tons of occ and mixed and white paper through our 18 recycling plants .", "our container plants are supported by regional design centers , which offer total packaging solutions and supply chain initiatives .", "in emea , our operations include one recycled fiber containerboard mill in morocco , a recycled containerboard mill in spain and 26 container plants in france , italy , spain , morocco and turkey .", "in brazil , our operations include three containerboard mills and four box plants .", "international paper also produces high quality coated paperboard for a variety of packaging end uses with 428000 tons of annual capacity at our mills in poland and russia .", "global cellulose fibers our cellulose fibers product portfolio includes fluff , market and specialty pulps .", "international paper is the largest producer of fluff pulp which is used to make absorbent hygiene products like baby diapers , feminine care , adult incontinence and other non-woven products .", "our market pulp is used for tissue and paper products .", "we continue to invest in exploring new innovative uses for our products , such as our specialty pulps , which are used for non-absorbent end uses including textiles , filtration , construction material , paints and coatings , reinforced plastics and more .", "our products are made in the united states , canada , france , poland , and russia and are sold around the world .", "international paper facilities have annual dried pulp capacity of about 4 million metric tons .", "printing papers international paper is one of the world 2019s largest producers of printing and writing papers .", "the primary product in this segment is uncoated papers .", "this business produces papers for use in copiers , desktop and laser printers and digital imaging .", "end-use applications include advertising and promotional materials such as brochures , pamphlets , greeting cards , books , annual reports and direct mail .", "uncoated papers also produces a variety of grades that are converted by our customers into envelopes , tablets , business forms and file folders .", "uncoated papers are sold under private label and international paper brand names that include hammermill , springhill , williamsburg , postmark , accent , great white , chamex , ballet , rey , pol , and svetocopy .", "the mills producing uncoated papers are located in the united states , france , poland , russia , brazil and india .", "the mills have uncoated paper production capacity of over 4 million tons annually .", "brazilian operations function through international paper do brasil , ltda , which owns or manages approximately 329000 acres of forestlands in brazil. ."], "table": [["in millions", "2018", "2017", "2016"], ["smurfit-kappa acquisition proposal costs", "$ 12", "$ 2014", "$ 2014"], ["environmental remediation reserve adjustment", "9", "2014", "2014"], ["legal settlement", "9", "2014", "2014"], ["write-off of certain regulatory pre-engineering costs", "2014", "2014", "8"], ["total", "$ 30", "$ 2014", "$ 8"]], "table_ori": [["In millions", "2018", "2017", "2016"], ["Smurfit-Kappa acquisition proposal costs", "$12", "$—", "$—"], ["Environmental remediation reserve adjustment", "9", "—", "—"], ["Legal settlement", "9", "—", "—"], ["Write-off of certain regulatory pre-engineering costs", "—", "—", "8"], ["Total", "$30", "$—", "$8"]]}

Question: considering the other corporate special items in addition , what is the variation observed in the other pre-tax corporate special items during 2017 and 2018 , in millions of dollars?
Evidence:
text_0: other corporate special items in addition , other pre-tax corporate special items totaling $ 30 million , $ 0 million and $ 8 million were recorded in 2018 , 2017 and 2016 , respectively .
Program: subtract(30, 0)
Answer:
str_answer: 30
exe_answer: 30