list different articles by the same authos without the dash in the bibliography

Hello,
with the Style „Chicago Manual of Style 16th edition (author-date)“ I get the following behaviour for two articles written by the exact same authors:

Müller, Hans, Hans Maier, und Hans Schmitt. 2000a. „titel1“.
———. 2000b. „titel2“.

But I'd rather like to have it as:

Müller, Hans, Hans Maier, und Hans Schmitt. 2000a. „titel1“.
Müller, Hans, Hans Maier, und Hans Schmitt. 2000b. „titel2“.

Can anyone tell me how to modify the style? I googled, but the only thing I figured out is that it might have something to do with the macro:
<macro name="contributors">

Thank you already!
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