| YEAR | ENGLISH | MATHEMATICS | READING | SCIENCE | COMPOSITE |
| IFS | STATE | IFS | STATE | IFS | STATE | IFS | STATE | IFS | STATE |
| 2005 | 22.9 | 19.9 | 21.7 | 20.2 | 20.9 | 20.3 | 20.7 | 20.4 | 21.7 | 20.3 |
| 2006 | 21.8 | 20.2 | 22.4 | 20.3 | 22.3 | 20.6 | 20.9 | 20.4 | 22 | 20.5 |
| 2007 | 22 | 20.2 | 21.8 | 20.4 | 21.5 | 20.5 | 21.5 | 20.4 | 21.9 | 20.5 |
| 2008 | 25.2 | 20.4 | 24.9 | 20.7 | 25.6 | 20.6 | 24.4 | 20.5 | 25.2 | 20.7 |
| 2009 | 25.3 | 20.5 | 23.2 | 20.7 | 22.4 | 20.8 | 22.3 | 20.7 | 23.4 | 20.8 |
| 2010 | 24.4 | 20.3 | 23.4 | 20.7 | 22.4 | 20.8 | 22.8 | 20.5 | 23.4 | 20.7 |
| 2011 | 25.3 | 20.6 | 23.3 | 20.9 | 23.7 | 20.8 | 22.8 | 20.5 | 23.4 | 20.7 |
| 2012 | 24.7 | 20.2 | 23.4 | 21 | 23.9 | 20.7 | 22.9 | 20.8 | 23.8 | 20.9 |
| 2013 | 24.1 | 20.2 | 22.8 | 20.7 | 22.4 | 20.4 | 22.5 | 20.5 | 23.1 | 20.6 |
| 2014 | 26.2 | 20.3 | 23.6 | 20.7 | 25.5 | 20.8 | 24.2 | 20.5 | 25.1 | 20.7 |
