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| Company | Unit | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 |
| Ashok Leyland | ... | ... | ... | ... | ... | ... | ... | 0.922 | 0.965 | 1.08 | 1.07 | 1.02 | ||||||||
| Tata Motors | 1.04 | 1.01 | 1.03 | 1.00 | 0.949 |
Helgi Library 
