sql

 select a.year, (select sum(fee) from test b where b.year <= a.year)
  from test a
 
 
  create table test(
     year varchar(8),
     fee number(8)
  )
 
  select *from test
 
  insert into test values('2000',1000)
  insert into test values('2001',2000);
  insert into test values('2002',3000);
  insert into test values('2003',4000);