I just did some numbers and if we take go back to 2011 with sales (this year alone the sales are down by 14% compared to 2013).
Being in 2011 this album would have sold 194082 copies. Now I dunno about you for for a genre that hasn't been touched in ages, talking about mainstream, that doesn't seem too shabby
(I am not taking into account her status in 2011 compared to now, back then it would have sold probably more due to her popularity).