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| Company | Unit | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 |
| Ford Motor Company | % | 55.1 | 59.9 | 58.9 | 57.2 | 61.4 | ||||||||||
| Tesla Inc. | % | ... | ... | ... | ... | ... | 53.5 | 86.0 | 76.8 | 46.0 | 48.4 |
Helgi Library 
