output format

my table is item which has four columns(it_id int,year date,define varchar,value varchar myisam),150000 rows
sample;
it_id,year,define,value
-----,----,------,-----
10,1998,asder,4578
10,2000,derse,56987
10,2001,dersen,7899
10,2002,versen,8899
10,2003,keren,7899
11,1999,sanal,56
11,2001,kanal,78
13,2001,buras,111
....
I can't change database design.
I want to see view output
year and value but values side by side for it_id.
forexample(select it_id for 10,11 ,do could'nt date,always all date selected)
year,val_10,val_11,...
----,------,------,
1998,4578,null
1999,null,56
2000,56987,null
2001,7899,78
2002,8899,null
2003,7899,null
.....

What can I do,How can.?
thanks for help.