pre_text: The Company incurred approximately $106,000 in legal, professional, and other costs related to this acquisition accounted for as selling and administrative expenses when incurred. The remaining weighted-average useful life of intangible assets acquired was 12.5 years as of the acquisition date. As the active cabinet business was not operated as a separate subsidiary, division or entity, Calix did not maintain separate financial statements for the active cabinet business. As a result, we are unable to accurately determine earnings/loss for the active cabinet business on a standalone basis since the date of acquisition. The following table below reflects our unaudited pro forma combined results of operations as if the acquisition had taken place as of October 1, 2016 and shows the net sales and net income as if the active cabinet business were combined with the Clearfield business for the years ended September 30, 2018 and 2017. The pro forma includes estimated expenses relating to the amortization of intangibles purchased, the amortization of the inventory fair value adjustment, and estimated personnel costs: The pro forma unaudited results do not purport to be indicative of the results which would have been obtained had the acquisition been completed as of the beginning of the earliest period presented or of results that may be obtained in the future. In addition, they do not include any benefits that may result from the acquisition due to synergies that may be derived from the elimination of any duplicative costs.
table: Pro Forma Year Ended September 30, 2018 (unaudited) Pro Forma Year Ended September 30, 2017 (unaudited)
table: Net sales $80,958,789 $89,672,074
table: Income from operations $5,554,766 $8,174,841
table: Net income 4,794,757 $5,809,018
table: Net income per share:
table: Basic 0.36 $0.43
table: Diluted 0.36 $0.43
question: Analyse this data from a financial earnings document. What is the percentage change in net sales from 2017 to 2018?