Excel remain in Tasks

I am using excel in my program and after i finish it remains in memory in the task manager. How can i get rid of this?

77 olExcel HANDLE OF APPLICATION.
77 olWrkBk HANDLE OF WORKBOOK.
77 olWrkSh HANDLE OF WORKSHEET.
77 olRange HANDLE OF RANGE.
77 olSheets HANDLE OF SHEETS.
77 olFormat HANDLE OF VARIANT.

CREATE-AND-OPEN-EXCEL-FILE.
    CREATE @Application of @Excel handle in olExcel.
    MODIFY olExcel Workbooks::@_Open 

    (BY NAME FILENAME OPNSAV-FILENAME,
    BY NAME Format xlCSV,
    BY NAME Delimiter ";",)
    GIVING olWrkBk.

    INQUIRE olWrkBk sheets() in olSheets.
    INQUIRE olSheets item(1) in olWrkSh.
.
*
QUIT-AND-DESTROY-EXCEL.
   MODIFY olWrkBk @Close()
    MODIFY olExcel Quit()

    DESTROY olSheets
    DESTROY olRange
    DESTROY olExcel
    DESTROY olWrkBk
    DESTROY olExcel
.