Cell lines with probability of dependency

The CCLE mutation table and sample info table from the DepMAP 21Q1 data set indicate each of the tables has 1747 and 1811 unique cell lines respectively. However, there are only 808 cell lines (for CRISPER) and 712 cell lines (for RNAi) with the probability of dependency. Why do other cell lines do not have dependency probability in either CRISPER or RNAi-based screens?

Thanks

We have not done genetic screens on all of our cell lines. So we may have cases where a line has omics data without CRISPR/RNAi. Also not all cases with RNAi have had CRISPR screens.