Correct me if i'm wrong, but your figures don't add up to all the Robinson types ie R22, R44. R22 alone has 504 occurences.
Yes, 830 R22/R44 occurrences on ASN over the 32 years that Robinsons have been flying, of which around 45% have been fatal.
That's one occurrence roughly every 14 days, and slightly less than one fatal accident per month.