pre_text: Comparison of Fiscal Year Ended September 28, 2018 to Fiscal Year Ended September 29, 2017 We acquired AppliedMicro on January 26, 2017 and certain assets of Picometrix on August 9, 2017, and we divested the Compute business on October 27, 2017 and our LR4 business on May 10, 2018. For additional information related to acquisitions and divestitures refer to Note 4 - Acquisitions and Note 23 - Divested Business and Discontinued Operations, respectively, in this Annual Report. Our annual Statements of Operations includes activity since the dates of acquisition for AppliedMicro and Picometrix and excludes activity for the Compute business and LR4 business after the date of the divestiture, representing less than twelve months of activity for AppliedMicro and Picometrix for the fiscal year ended September 29, 2017. Revenue. In fiscal year 2018, our revenue decreased by $128.4 million, or 18.4%, to $570.4 million from $698.8 million for fiscal year 2017. Revenue from our primary markets, the percentage of change between the years and revenue by primary markets expressed as a percentage of total revenue were (in thousands, except percentages): In fiscal year 2018, our Telecom market revenue decreased by $117.1 million, or 34.4%, compared to fiscal year 2017. The decrease was primarily due to lower sales of carrier-based optical semiconductor products to our Asia customer base, lower sales of products targeting fiber to the home applications and the May 2018 sale of our LR4 business. In fiscal year 2018, our Data Center market revenue decreased by $10.4 million, or 6.0%, compared to fiscal year 2017. The decrease was primarily due to decreased revenue from sales of legacy optical products and lasers and cloud data center applications. In fiscal year 2018, our I&D market revenues decreased by $0.9 million, or 0.5%, compared to fiscal year 2017. The decrease was primarily related to lower certain legacy defense products partially offset by higher revenue across other areas within the product portfolio.
table:  Fiscal Years  
table: 2018 2017 % Change
table: Telecom $222,940 $340,022 (34.4)%
table: Data Center 162,098 172,481 (6.0)%
table: Industrial & Defense 185,360 186,269 (0.5)%
table: 570,398 698,772 (18.4)%
table: Telecom 39.1% 48.6%
table: Data Center 28.4% 24.7%
table: Industrial & Defense 32.5% 26.7%
table: Total 100.0% 100.0%
question: Analyse this data from a financial earnings document. What is the change in Telecom value between fiscal year 2017 and 2018?