SAP Business One with DI API integration MS SQL mdf data growth fast

I am using SAP B1 9.0 PL 20 with MS SQL 2012, and i have a integrated program using SAP DI API.

I am trying to seek for help regarding with the fast grownth of the database specially my mdf file.

We started the integration not more than 1 year with 100MB only. But now we are having trouble with the growth of our database. Right now we have 200GB in mdf file database.

Can anyone help or explain what is the cause or what is the abnormality in this.