Which is the correct preposition?

Is it ‘oblivious of’ or ‘oblivious to’? Which is correct? I have come across both.

For me they both sound OK. This graph is interesting:

books.google.com/ngrams/graph?co … g=3&share=

The current century tends to go in favour of “to” according to the graph, though the British lexicons say it should be “of”.

T_H_Lawrence,
Could you quote me some good examples for ‘oblivious of’ and ‘oblivious to’?

People use the prepositions interchangeably. Where ‘of’ is meant, ‘to’ can also be opted for, they say. So, there is no point in illustrating it further. Still, you can see this example:

The doctor was oblivious of the presence of others as he was examining the seriously injured patient.
(Here, many are found to use ‘to’ in place of the ‘of’)