How much actual dancing did Natalie Portman do in 'Black Swan'?

I believe Sarah Lane, her body double. There's no way Portman could have done as much dancing in the movie as the studio is claiming. 38%
It's a smear job. Portman did most of her dancing. End of discussion. 4%
Who cares? Portman's performance was still brilliant, no matter how much dancing she did or didn't do. 35%
I think Portman's body double is just after a little fame and publicity. 14%
Like I said on Oscar night, Annette Bening was robbed. 8%

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