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Nationally, an estimated 46,446 clients were receiving pharmacotherapy treatment on the 'snapshot' day in June 2011. The largest proportion of clients in 2011 was in New South Wales (41%), followed by Victoria (30%) and Queensland (12%).  The number of clients has risen from 1.3 per 1,000 population in 1998 to 2.1 in 2011.

Total number of pharmacotherapy clients receiving pharmacotherapy treatment on a 'snapshot/specified' day by state and territory, 1998–2011
Year NSW Vic Qld WA SA Tas ACT NT Australia
1998 12,107 5,334 3,011 1,654 1,839 306 406 24,657
1999 12,500 6,700 3,341 2,449 1,985 370 559 2 27,906
2000 13,594 7,647 3,588 2,140 2,198 423 615 32 30,237
2001 15,069 7,743 3,745 2,307 2,522 464 641 25 32,516
2002 15,471 7,700 3,896 3,602 2,417 513 590 21 34,210
2003 16,165 8,685 4,289 4,079 2,486 498 686 98 36,986
2004 15,719 10,003 4,470 4,437 2,706 576 748 82 38,741
2005 16,469 10,753 4,440 2,883 2,857 588 764 183 38,937
2006 16,355 10,736 4,637 2,888 2,823 602 790 134 38,965
2007 16,348 11,051 4,309 2,822 2,834 600 765 114 38,843
2008 17,168 11,821 4,899 2,908 3,052 588 786 125 41,347
2009 17,868 12,576 5,116 3,187 3,151 634 792 121 43,445
2010 19,114 13,185 5,688 3,342 3,210 620 811 108 46,078
2011 18,831 13,755 5,702 3,382 3,183 645 825 123 46,446

Notes:
1. Each state and territory uses a different method to collect data on pharmacotherapy prescription and dosing. These differences may result in minor discrepancies if directly comparing one jurisdiction with another jurisdiction.
2. In Western Australia the number of clients receiving pharmacotherapy treatment are reported through the month of June. Before 2005, Western Australia reported clients over the the whole year. 

Source: National Opioid Pharmacotherapy Statistics Annual Data collection: 2011 report