Tamils in SL 

 is the percentage of ethnic groups in SL. Sri Lankan Tamils are not the only Tamils live in Sri Lanka. Sri Lankan Tamils used to one ethnic group. Rest of the Tamils introduced with different names. There are 3 Tamil ethnic groups lives in SL. 

Census 2011.

Sri Lankan Tamils 11.21%
Sri Lankan Moors 9.23%
Indian Tamils 4.16%