From your dashboard, click "More"
Choose "Archived Classes"
Click on the class you want to view grades for
In the "Assignments" tab, click on an assignment to view data
Click the "Analyze" icon that appears in the the actions bar to view the data
View the data
Click the "Grades" icon in the actions bar to download a .CSV file of the grades
Choose a date range and click "Export"
The downloaded .CSV file can be opened in Microsoft Excel, or imported into any spreadsheet program or LMS.