SQL & PL/SQL

Hi All,

DB 8ii
OS HPUX

I have a requirement, where I need to check, percentage of increse in database over last one year. Although, I have a following quety, which does the same, but not able to figure out on how can I re-write to address my issue, if I need one more coulum, which will show % of increment. Also, is there any possibility of changing the order of result set. like 2010 jul must appear before 2010 aug. thank you very much.

select to_char(creation_time, 'RRRR Month') "Month",
       sum(bytes)/1024/1024 "Growth in Meg"
  from sys.v_$datafile
 where creation_time > SYSDATE-365
 group by to_char(creation_time, 'RRRR Month') 

MONTH                            GROWTH IN MEG
-------------------------------- -------------
2010 AUGUST                               6000
2010 JULY                                 2448
2010 NOVEMBER                             8000
2010 OCTOBER                              6000
2011 APRIL                              223000
2011 JANUARY                             13100
2011 JUNE                               128000
2011 MARCH                              148500
2011 MAY                                112000