You can get the full details in the .pdf, which shows the following numbers:
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2002: 556799
2003: 836312 | change from previous year: +50% | all books change: +1.5%
2004: 888145 | change from previous year: +5.6% | all books change: +2.9%
2005: 829273 | change from previous year: -6.1% | all books change: +5.5%
2006: 744687 | change from previous year: -10.2% | all books change: -0.3%
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compound change from 2002-2006: religious +7.5% | all books +2.4%
Honestly, it seems like nothing to me. If anything, religious reading has been slightly down for two years, but after the huge bump in 2003, it has still grown 3 times faster than all other book categories. I was a bit miffed to read this poor a presentation by the IHS:HNN.
Technorati tags: God, Religion