Why tkprof did not show explain plan for some sql statements

Hi,
I did a trace for one of the session, hoping to find the explain plan for its tkprof. However, I only get this:
INSERT INTO AUDIT_TABLE
VALUES
( :B1 , :B2 , :B3 , :B4 , :B5 , :B6 , :B8 , :B7 )
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.00       0.00          0          0          0           0
Execute   3698      8.08      59.41       3348        566      19092        3698
Fetch        0      0.00       0.00          0          0          0           0
total     3699      8.08      59.42       3348        566      19092        3698
Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: CHOOSE
Parsing user id: 30     (recursive depth: 2)
********************************************************************************Any idea why the explain plan is missing?
Also looking at the above statistics, what can I conclude?

Thanks John. What's ur take on this statistics then?
call     count       cpu    elapsed       disk      query    current        rows
Parse        0      0.00       0.00          0          0          0           0
Execute   1798     12.23      36.75       1758       5404       7418        1798
Fetch        0      0.00       0.00          0          0          0           0
total     1798     12.23      36.75       1758       5404       7418        1798
Misses in library cache during parse: 0
Optimizer mode: CHOOSE
Parsing user id: 30     (recursive depth: 1)
********************************************************************************

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