Companies with data for all years examined

For the companies listed below data were available for all five years we examined (2014, 2013. 2012, 2006, 2000):

 Amazon  Delta Airlines  Honeywell Int’l  Procter & Gamble
 Apple  DirecTV  Humana  Safeway
 ADM  Dow Chemical  IBM  Supervalu
 AT&T  Dupont  Ingram Micro  Sysco
 Best Buy  Enterprise Products   Intel  Target
 Boeing  Express Scripts  Johnson & Johnson  Tesoro
 Cardinal Health  Exxon Mobil  Johnson Controls  Tyson Foods
 Caterpillar  Fedex  Kroger  United Technologies
 Chevron  Ford Motor Company  Lockheed Martin  UnitedHealth
 CHS  General Dynamics  Lowe’s  UPS
 Cigna  General Electric  McKesson  Valero Energy
 Cisco Systems  General Motors  Microsoft  Verizon
 Coca-Cola  HCA  Oracle  Wal-Mart
 Comcast  Hess  PepsiCo  Walgreen
 Costco Wholesale  Hewlett-Packard  Pfizer  Walt Disney 
 CVS  The Home Depot  Philip Morris   World Fuel Services
 Deere & Company