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 26 , 2014 and october 27 , 2013 was as follows : 2014 2013 ( in millions , except percentages ) .

2014
2013
(In millions, except percentages)
Silicon Systems Group
$1,400
48%
$1,295
55%
Applied Global Services
775
27%
591
25%
Display
593
20%
361
15%
Energy and Environmental Solutions
149
5%
125
5%
Total
$2,917
100%
$2,372
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 cancellation of orders .
customers may delay delivery of products or cancel orders prior to shipment , subject to possible cancellation penalties .
delays in delivery schedules and/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 ( collectively , parts ) 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 the united states , europe , israel , singapore , taiwan , and other countries in asia , and assembly of some systems is completed at customer sites .
applied uses numerous vendors , including contract manufacturers , to supply parts and assembly services for the manufacture and support of its products .
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 : ( 1 ) selecting and qualifying alternate suppliers for key parts ; ( 2 ) monitoring the financial condition of key suppliers ; ( 3 ) maintaining appropriate inventories of key parts ; ( 4 ) qualifying new parts on a timely basis ; and ( 5 ) locating certain manufacturing operations in close proximity to suppliers and customers .
research , development and engineering applied 2019s long-term growth strategy requires continued development of new products , including products that enable expansion into new markets .
the company 2019s significant investment in research , development and engineering ( rd&e ) has generally enabled it to deliver new products and technologies before the emergence of strong demand , thus allowing customers to incorporate these products into their manufacturing plans at an early stage in the technology selection cycle .
applied works closely with its global customers to design systems and processes that meet their planned technical and production requirements .
product development and engineering organizations are located primarily in the united states , as well as in europe , israel , taiwan , and china .
in addition , applied outsources certain rd&e activities , some of which are performed outside the united states , primarily in india and singapore .
process support and customer demonstration laboratories are located in the united states , china , taiwan , europe , and israel .
applied 2019s investments in rd&e for product development and engineering programs to create or improve products and technologies over the last three years were as follows : $ 1.4 billion ( 16 percent of net sales ) in fiscal 2014 , $ 1.3 billion ( 18 percent of net sales ) in fiscal 2013 , and $ 1.2 billion ( 14 percent of net sales ) in fiscal 2012 .
applied has spent an average of 13 percent of net sales in rd&e over the last five years .
in addition to rd&e for specific product technologies , applied maintains ongoing programs for automation control systems , materials research , and environmental control that are applicable to its products. .

Question: Analyse this data from a financial earnings document. what is the growth rate in sales from 2013 to 2014?
Choices:
0.01528
0.03846
16.21154
0.21154
-0.99368
Correct choice index: 3