These are from google trends.
Data science is growing, but still way behind other traditional terms for our field such as data mining, predictive analytics and machine learning. Big data on the other hand is growing rapidly and outpacing other fields.
This page for now is just an FYI that I may refer to in today's DM Radio show, "Blinded by Data Science" (http://bit.ly/KfK74l ). I hope to turn it into a more cogent blog post soon (but no promises!)