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| Company | Unit | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 |
| Ashok Leyland | % | ... | ... | ... | ... | ... | ... | ... | 25.1 | 14.5 | 11.1 | 8.14 | 22.0 | ||||||
| Tata Motors | % | 29.6 | 18.5 | 13.0 | -1.90 | 6.94 |
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