rdlcs reports not showing the data as in the query.

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RDLC

reporting

I am using rdlc reports to show vehicle data. the select query that defines in sqldatasource for rdlc reports is not showing the whole data.
I run the same query on sql server it returns all records but on report it only show randomly 15 record.

<rsweb:ReportViewer ID="ReportViewer1" runat="server" Font-Names="Verdana"
        Font-Size="8pt" InteractiveDeviceInfos="(Collection)"
        style="text-align: center; margin-left: 58px" WaitMessageFont-Names="Verdana"
        WaitMessageFont-Size="14pt" Width="" Height="">
        <LocalReport ReportPath="ViewUpdates\Disposevehicles.rdlc">
            <DataSources>
                <rsweb:ReportDataSource DataSourceId="SqlDataSource2" Name="DataSet1" />
            </DataSources>
        </LocalReport>
    </rsweb:ReportViewer>
    <asp:SqlDataSource ID="SqlDataSource2" runat="server"
        ConnectionString="<%$ ConnectionStrings:ApplicationServices %>"
        SelectCommand="SELECT VehicleRegNum, Make, Type, DateOfPurchase, DateOfReg, DateOfDisposal, Agency FROM Disposedvehiclesview WHERE (Agency = @Name)">
        <SelectParameters>
            <asp:ControlParameter ControlID="DropDownList1" Name="Name"
                PropertyName="SelectedValue" />
        </SelectParameters>
    </asp:SqlDataSource>