Number of magazines published annually in the US?

Number of magazines published annually in the US?
According to one source in 2005, more than 10,000 magazines are published in the U.S. but only 2,000 have significant circulation. See the following web page for the source of the information: http://findarticles.com/p/articles/mi_m0EIN/is_2005_Sept_21/ai_n15402401