purchased scrap metal from third-parties ) that were either divested or permanently closed in december 2014 ( see global rolled products below ) .intersegment sales for this segment improved 12% ( 12 % ) in 2014 compared with 2013 , principally due to an increase in average realized price , driven by higher regional premiums , and higher demand from the midstream and downstream businesses .atoi for the primary metals segment decreased $ 439 in 2015 compared with 2014 , primarily caused by both the previously mentioned lower average realized aluminum price and lower energy sales , higher energy costs ( mostly in spain as the 2014 interruptibility rights were more favorable than the 2015 structure ) , and an unfavorable impact related to the curtailment of the s e3o lu eds smelter .these negative impacts were somewhat offset by net favorable foreign currency movements due to a stronger u.s .dollar against most major currencies , net productivity improvements , the absence of a write-off of inventory related to the permanent closure of the portovesme , point henry , and massena east smelters ( $ 44 ) , and a lower equity loss related to the joint venture in saudi arabia , including the absence of restart costs for one of the potlines that was previously shut down due to a period of instability .atoi for this segment climbed $ 614 in 2014 compared with 2013 , principally related to a higher average realized aluminum price ; the previously mentioned energy sales in brazil ; net productivity improvements ; net favorable foreign currency movements due to a stronger u.s .dollar against all major currencies ; lower costs for carbon and alumina ; and the absence of costs related to a planned maintenance outage in 2013 at a power plant in australia .these positive impacts were slightly offset by an unfavorable impact associated with the 2013 and 2014 capacity reductions described above , including a write-off of inventory related to the permanent closure of the portovesme , point henry , and massena east smelters ( $ 44 ) , and higher energy costs ( particularly in spain ) , labor , and maintenance .in 2016 , aluminum production will be approximately 450 kmt lower and third-party sales will reflect the absence of approximately $ 400 both as a result of the 2015 curtailment and closure actions .also , energy sales in brazil will be negatively impacted by a decline in energy prices , while net productivity improvements are anticipated .global rolled products .
[['', '2015', '2014', '2013'], ['third-party aluminum shipments ( kmt )', '1775', '1964', '1905'], ['alcoa 2019s average realized price per metric ton of aluminum*', '$ 3514', '$ 3743', '$ 3730'], ['third-party sales', '$ 6238', '$ 7351', '$ 7106'], ['intersegment sales', '125', '185', '178'], ['total sales', '$ 6363', '$ 7536', '$ 7284'], ['atoi', '$ 244', '$ 245', '$ 292']]
* generally , average realized price per metric ton of aluminum includes two elements : a ) the price of metal ( the underlying base metal component plus a regional premium 2013 see the footnote to the table in primary metals above for a description of these two components ) , and b ) the conversion price , which represents the incremental price over the metal price component that is associated with converting primary aluminum into sheet and plate .in this circumstance , the metal price component is a pass- through to this segment 2019s customers with limited exception ( e.g. , fixed-priced contracts , certain regional premiums ) .this segment represents alcoa 2019s midstream operations and produces aluminum sheet and plate for a variety of end markets .approximately one-half of the third-party shipments in this segment consist of sheet sold directly to customers in the packaging end market for the production of aluminum cans ( beverage , food , and pet food ) .seasonal increases in can sheet sales are generally experienced in the second and third quarters of the year .this segment also includes sheet and plate sold directly to customers and through distributors related to the aerospace , automotive , commercial transportation , building and construction , and industrial products ( mainly used in the production of machinery and equipment and consumer durables ) end markets .a small portion of this segment also produces aseptic foil for the packaging end market .while the customer base for flat-rolled products is large , a significant amount of sales of sheet and plate is to a relatively small number of customers .in this circumstance , the sales and costs and expenses of this segment are transacted in the local currency of the respective operations , which are mostly the u.s .dollar , the euro , the russian ruble , the brazilian real , and the british pound. .

Question: what was the percentual decrease observed in alcoa 2019s average realized price per metric ton of aluminum during 2014 and 2015?
Answer: 6.51%
Explanation: it is the percentual decrease of alcoa 2019s average realized price per metric ton of aluminum , which is calculated by dividing the value in 2015 by the value in 2014 , then turned into a percentage.\\n