Too many extents for table on locally managed uniform ASSM tablespace

Running Oracle 9.2.0.8 on solaris 10, Enterprise edition.
Tablespace configuration:
select extent_management, allocation_type, segment_space_management, block_size, initial_extent, next_extent
from dba_tablespaces
where tablespace_name = 'PCLARGE';
LOCAL UNIFORM AUTO 8192 2097152 2097152
A nightly peoplesoft SQR job inserts and updates the problem table. The job has been in place without change for four years. During that time, the database moved from 8i to 9i, and the tablespace parameters moved to uniform local ASSM. The job selects from a 70 million row table and then updates the target summary table.
Can somebody help me understand why the number of extents would grow way out of proportion to the number of rows?
When the row count was 9807427, this table had 233 extents.
Row count 10759033, table had 501 extents.
Row count 10764665, table has 1967 extents.
The table is not analyzed since the system is using RULE. DBMS_SPACE.SPACE_USAGE indicates no extents above the high water mark. Running SELECT name,value FROM v$sysstat WHERE name like '%table%' seems to indicate that chained rows are not a factor, since the row with name "table fetch continued row" returns a small amount of rows.
Any ideas? Is it possible there is a bug with ASSM that is causing this?
Unfortunately I don't have detailed extent history information after each nightly run. I just have the 3 data points above.

Hi Hemant,
Thanks for your reply! No parallelism was involved in the SQR script.
Oracle support has pointed me to Metalink Note:469985.1: Sudden Increase in Unformatted Blocks. This behavior matches our symptoms. My company is going to pursue a backport, but in the meantime we may need to move data into tablespaces without ASSM.
Best regards,
Ben

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