Two new tables per month (no replies)

Hi. I noticed that every month a new table is being created in my database. This is happening since january 2015. The table is:

Quote

piwik_archive_blob_2015_01
piwik_archive_blob_2015_02
piwik_archive_blob_2015_03
piwik_archive_blob_2015_04
piwik_archive_blob_2015_05
piwik_archive_blob_2015_06
piwik_archive_numeric_2015_01
piwik_archive_numeric_2015_02
piwik_archive_numeric_2015_03
piwik_archive_numeric_2015_04
piwik_archive_numeric_2015_05
piwik_archive_numeric_2015_06

I think this is not good, because my host is shared and the Policies says that I have a limit of 2000 tables, if two new tables are being created every month, this will limit my server in future because I don't have only Piwik, but more two databases in my server.

So my question is, there is a way to disable this? Thank you