Coding versus non-coding sequence in C. elegans genome

I was trying to find some information about this without success: What is the ratio of coding sequence to non-coding sequence in the C. elegans genome? When trying to calculate the number of haploid genomes you need to screen for a saturated reverse genetic screen, this information may be handy. Any idea, anyone?

Do you mean genic vs non-genic or exonic DNA vs everything else? There is a file in each WormBase release with all the intergenic sequences, and this totals about 416 Mb suggesting that about 58.5% of the genome codes for genes (though 20% of genes have no transcript evidence).