By default, PROC PRINT identifies each observation by number under the column heading Obs.

             Monthly Price Per Unit and Sale Type for Each Country             1

                                                          Sale_
               Obs    Country                   Price      Type

                 1    Antarctica                 92.6    Internet

                 2    Puerto Rico                51.2    Catalog 

                 3    Virgin Islands (U.S.)      31.1    In Store

                 4    Aruba                     123.7    Catalog 

                 5    Bahamas                   113.4    Catalog 

                 6    Bermuda                    41.0    Catalog 

                 7    Belize                    146.4    In Store

                 8    British Virgin Islands     40.2    Catalog 

                 9    Canada                     11.8    Catalog 

                10    Cayman Islands             71.0    In Store
 
 
 
 
 
                                 *prices in USD