what is the growth rate in the segment of display from 2014 to 2015?
backlog applied manufactures systems to meet demand represented by order backlog and customer commitments . backlog consists of : ( 1 ) orders for which written authorizations have been accepted and assigned shipment dates are within the next 12 months , or shipment has occurred but revenue has not been recognized ; and ( 2 ) contractual service revenue and maintenance fees to be earned within the next 12 months . backlog by reportable segment as of october 25 , 2015 and october 26 , 2014 was as follows : 2015 2014 ( in millions , except percentages ) .

|  | 2015 | 2014 |  | (In millions, except percentages) |
| :--- | :--- | :--- | :--- | :--- |
| Silicon Systems | $1,720 | 55% | $1,400 | 48% |
| Applied Global Services | 812 | 26% | 775 | 27% |
| Display | 525 | 16% | 593 | 20% |
| Energy and Environmental Solutions | 85 | 3% | 149 | 5% |
| Total | $3,142 | 100% | $2,917 | 100% |

applied 2019s backlog on any particular date is not necessarily indicative of actual sales for any future periods , due to the potential for customer changes in delivery schedules or order cancellations . customers may delay delivery of products or cancel orders prior to shipment , subject to possible cancellation penalties . delays in delivery schedules or a reduction of backlog during any particular period could have a material adverse effect on applied 2019s business and results of operations . manufacturing , raw materials and supplies applied 2019s manufacturing activities consist primarily of assembly , test and integration of various proprietary and commercial parts , components and subassemblies that are used to manufacture systems . applied has implemented a distributed manufacturing model under which manufacturing and supply chain activities are conducted in various countries , including germany , israel , italy , singapore , taiwan , the united states and other countries in asia . applied uses numerous vendors , including contract manufacturers , to supply parts and assembly services for the manufacture and support of its products , including some systems being completed at customer sites . although applied makes reasonable efforts to assure that parts are available from multiple qualified suppliers , this is not always possible . accordingly , some key parts may be obtained from only a single supplier or a limited group of suppliers . applied seeks to reduce costs and to lower the risks of manufacturing and service interruptions by selecting and qualifying alternate suppliers for key parts ; monitoring the financial condition of key suppliers ; maintaining appropriate inventories of key parts ; qualifying new parts on a timely basis ; and ensuring quality and performance of parts. .

display_2015 = 525
display_2014 = 593
decrease = display_2015 - display_2014
percent_change = decrease / display_2014
answer = percent_change * 100