Feb 21 (Reuters) - British business media group Informa Plc reported a 7 percent rise in its full-year adjusted pretax profit as its academic book publishing business offset a decline in its events business. Informa, which publishes real-time news, research, market data, as well as over 55,000 academic books and journals, said it did not expect any significant improvement in economic conditions this year. But it expects underlying revenue growth across all three business divisions.