NOBLE ENERGY INC | 2013 | FY | 3

The largest single non-affiliated purchasers of our production were as follows:
 
 
Percentage of Crude Oil Sales
 
Percentage of Total Oil, Gas & NGL Sales
Year Ended December 31, 2013
 
 
 
 
Glencore Energy UK Ltd
 
34
%
 
25
%
Shell (1)
 
17
%
 
13
%
Year Ended December 31, 2012
 
 

 
 

Glencore Energy UK Ltd
 
39
%
 
31
%
Shell (1)
 
17
%
 
14
%
Year Ended December 31, 2011
 
 

 
 

Glencore Energy UK Ltd
 
24
%
 
16
%
Shell (1)
 
17
%
 
12
%
(1) Includes sales to both Shell Trading (US) Company and Shell International Trading and Shipping Limited.

us-gaap:SchedulesOfConcentrationOfRiskByRiskFactorTextBlock