You can view the import history by following the steps below:

1. Open the Contacts tab from the navigation bar. Click All Contacts sub tab. 
2. Click Import Overview from the More option present on the top right corner.
   
3. This shows the contacts segregated as:
   
1. Total contacts
   
2. New contacts
   
3. Re-added contacts
   
4. Duplicate contacts
   
5. Ignored Contacts, which comprises different scenarios for ignored contacts.