This figure shows the trend of notifications received by the National Notifiable Disease Surveillance System from 1991 to 2011. The figure demonstrates a gradual increase over time from 43,000 notifications in 1991 to 159,000 notifications in 2008. In 2009 notifications peaked at 236,000, decreased slightly in 2010 to 209,000 and peaked again in 2011 with 238,000 notifications.