Job-tracking site indeed.com shows the rate at which certain terms appear in job advertisements. As you can see from the chart below, demand for R language skills is on the rise, while the number of SAS-related job postings peaked in late 2010 and has been declining steadily since early 2012.
I included the word "statistics" in the search to filter out any job ads that mentioned "SAS" or "R" but weren't related to data analysis. Just for kicks, here's the same chart with "SPSS statistics" and "Cobol" also included:
The searches above were performed today; click on the charts to get an up-to-date search. You can try your own search terms at Indeed Job Trends.