Please answer the given financial question based on the context.
Context: 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|$ 1720|55% ( 55 % )|$ 1400|48% ( 48 % )|
|applied global services|812|26% ( 26 % )|775|27% ( 27 % )|
|display|525|16% ( 16 % )|593|20% ( 20 % )|
|energy and environmental solutions|85|3% ( 3 % )|149|5% ( 5 % )|
|total|$ 3142|100% ( 100 % )|$ 2917|100% ( 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. .
Question: how much percentage has backlog increased from 2014 to 2015
Answer:
0.07713