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| Company | Unit | 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 |
| CVS Health | % | ... | ... | ... | ... | ... | ... | ... | 12.4 | 11.9 | 11.1 | 10.4 | 10.3 | |||||||||||||||
| Walgreens Boots | % | 23.9 | 23.3 | 21.2 | 20.2 | 19.9 |
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