| 1995 | 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | 0.51 | 1.08 | 1.56 | 2.58 | 3.83 | 5.03 | 3.79 | 4.68 | 5.16 | 5.93 | 7.37 | 7.62 | 8.18 | 9.24 | 9.47 |
| Healthcare-associated | 0.32 | 0.75 | 1.05 | 1.84 | 2.88 | 3.51 | 2.66 | 3.12 | 3.58 | 4.16 | 5.09 | 5.87 | 5.76 | 6.21 | 6.17 |