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