• Here is another alternative..

    select TheDate

    ,TheMonth

    ,WeekName

    ,ParcelCount2013

    ,case when TheDate is not null and TheDate > '2014-10-02' and TheDate < '2015-01-01' then ParcelCount2013 + ((ParcelCount2013 * 5)/100) else ParcelCount2014 end as Parcel_Count_2014

    from d