[ns] Awk script for throughput in wired environment

Hi everyone!
Can anyone pls help me with providing awk script for throughput evaluation
in wired environment.... My sample trace file is

+ 0.51 0 2 cbr 500 ------- 1 0.0 4.0 2 2
- 0.51 0 2 cbr 500 ------- 1 0.0 4.0 2 2
r 0.514 0 2 cbr 500 ------- 1 0.0 4.0 0 0
+ 0.514 2 3 cbr 500 ------- 1 0.0 4.0 0 0
- 0.514 2 3 cbr 500 ------- 1 0.0 4.0 0 0
+ 0.515 0 2 cbr 500 ------- 1 0.0 4.0 3 3
- 0.515 0 2 cbr 500 ------- 1 0.0 4.0 3 3
r 0.519 0 2 cbr 500 ------- 1 0.0 4.0 1 1
+ 0.519 2 3 cbr 500 ------- 1 0.0 4.0 1 1
- 0.519 2 3 cbr 500 ------- 1 0.0 4.0 1 1
+ 0.52 0 2 cbr 500 ------- 1 0.0 4.0 4 4
- 0.52 0 2 cbr 500 ------- 1 0.0 4.0 4 4
r 0.524 0 2 cbr 500 ------- 1 0.0 4.0 2 2

Thanks...