Where can I find mean global temperature data by year?

Preferably in a table. I keep coming up with graphs, and usually of anomaly values instead of mean.

I know we have records dating back to 1880. I need this information to do a confidence interval for my statistics class. Mean by decade from 1890-1950 and and mean by decade from 1950-2010. I'll do a hypothesis test for the difference between these means being greater than 0. I know that's not scientifically sound work but it's in my project guidelines.