Principal components Eigen values

Dear everyone,
I used SNAP to calculate PCA. It works well. In metadata, there is “basic vectors” which seem to be the eigenvectors of the principal components. I need to determine the percent variance for component1, component2,…component n (to determine percent of explained variance for each component). So, it would be great if you can tell me where are the eigenvalues or how to calculate it?

Thanks so much!
best regards,