with t as
(
select '05' hh, 2   cnt  union all
select '06' hh, 4   cnt  union all
select '07' hh, 6   cnt  union all
select '08' hh, 12  cnt  union all
select '09' hh, 36  cnt  union all
select '10' hh, 49  cnt  union all
select '11' hh, 73  cnt  union all
select '12' hh, 117 cnt  union all
select '13' hh, 139 cnt  union all
select '14' hh, 174 cnt  union all
select '15' hh, 204 cnt  union all
select '16' hh, 219 cnt  union all
select '17' hh, 235 cnt  union all
select '18' hh, 245 cnt  union all
select '19' hh, 253 cnt  union all
select '20' hh, 256 cnt  union all
select '21' hh, 257 cnt  union all
select '22' hh, 260 cnt  union all
select '23' hh, 266 cnt 
)
select hh, cnt - isnull(lag(cnt) over(order by hh),0) cnt 
  from t
 order by hh