I use Music Collector to track my music catalog, and according to the database, I purchased only 53 titles with a 2010 release date. That number may be inaccurate since titles may be counted twice if I both downloaded it and bought a CD. Still, 53 is less than the number of titles I purchased that were released in 2009 (61), 2008 (96) or 2007 (92).
Another inaccuracy with the database is the date of purchase, which I don’t actively track but can approximate by the numerical ID of the database (high numbers == more recent purchase). So as an experiment, I cross-referenced my purchases in Quicken with my music database and grouped those purchases by year. Then I further grouped the results by release date. (I like data entry. Sue me.)
The earliest year I have purchase data is 2007, when I started tracking my finances in Quicken. In 2007, I purchased and downloaded 196 titles, 65 of which were released that year. That means 131 titles were catalog. (But I own 92 titles released in 2007. Why the discrepancy? Because 27 of those titles were purchased in subsequent years.) In 2008, I bought 69 new releases out of 159, with 90 catalog titles. In 2009, 51 out of 112 titles were new releases, leaving 61 catalog titles. 2010 — 53 out of 115, with 62 catalog titles.
The numbers are clear — catalog makes up the bulk of my listening now.