The information requested is provided in the following table:
Percentage 1997-98 1998-99 1999-2000 2000-01 2001-02 2002-03 2003-04 2004-05 2005-06 2006-07 Strategic health authorities 84 85 84 86 84 80 82 85 87 82 Primary care trusts n/a n/a n/a 82 82 83 85 85 84 83 National health service trusts 79 81 84 84 84 82 83 83 77 78 Ambulance trusts n/a n/a 86 89 87 88 88 85 86 82 All NHS 79 81 84 85 84 82 84 83 79 80