The export should be default include the table data. Make sure that Skip table data (no-data) in the options sub-panel is unchecked before you start the export.
If that doesn't work, try reverse engineering your database by going to the menu option Database > Reverse Engineer and complete the steps.
After you've reverse engineered your database, go to File > Export > Forward Engineer SQL CREATE Script.
Under SQL Options, check the box Generate INSERT statements for Tables and then continue the export process.