I did a bit of a search on the net myself and found Toto Gold described as a short lived perennial that will survive most winters.
So, basically if i were you i would be saving some seed from the plant (if it has flowered) as an insurance policy.
I love all Rudbeckias ( even if they all tend to be yellow) i even have the weird ( to some people) variety green wizard that doesnt have any petals just the green sepals and the black cone "bit".
if you like the Toto Gold and want a Rudbeckia that is reliable and that you can divide after a few years I would go for the Goldstrum variety.
Hope this helps