Help understanding stat tables - Mailing list pgsql-performance

I just want to make sure that I am interpreting this data correctly.

From pg_statio_user_tables, I have pulled relname, heap_blks_read,
heap_blks_hit.  I get several rows like this:
relname                heap_bkls_read    heap_blks_hit
 clmhdr                           8607161            196547165







                                                                                               


So this means that I am getting over a 100% cache hit ratio for this table,
right?  If not, please help me understand what these numbers mean.

Thanks,

Chris