University of Illinois Chicago

Back in 2006 UIC said that they had done 4,643 Quantiferon. Then in 2009 they said that they had done 7,499. Last May UIC called for tenders to supply an estimated $US1.17M QFT over 3 years, which works out to roughly 56,000 tests.

I dont have data for other years so they remain blank

This is how it looks in a graph however it should not be regarded as definitive,
only indicative of future sales;