[SI-LIST] how to calculate maximum current that can be provided by one via

Dear Experts,
 
I have a question about how to calculate maximum current that can be provided 
by one via. In my layout, oscillator's GND pin only have one via to GND plane. 
From oscillator datasheet, it says the component needs about 36mA current. So I 
worry about current capacity of the GND via. The via that I used is 12mil hole 
diameter and 24mil pad. It's difficuit to add two vias in layout due to limited 
PCB space. Does any body can tell me how big current can be provided by one 
12mil-24mil via ? Thanks a lot!
 
Best regards,
 
Peter Pang
XGI Technology (Shanghai) Inc. 
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