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| Company | Unit | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 |
| Ashok Leyland | % | 0.850 | 0.301 | 1.32 | 1.68 | 0.461 | |||||||
| Tata Motors | % | 0.941 | 0.853 | 0.829 | 0.796 | 0.831 |
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