| Fiscal Year | Rate | Rate Type |
|---|---|---|
| 2006 | 4.3 | 2 year official |
| 2007 | 4.6 | 2 year official |
| 2008 | 3.6 | 2 year official |
| 2009 | 6.7 | 3 year official |
| 2010 | 8.5 | 3 year official |
| 2011 | 8.8 | 3 year official |
| 2012 | 7.7 | 3 year official |
| 2013 | 7 | 3 year official |
| 2014 | 7.2 | 3 year official |
| 2015 | 7.4 | 3 year official |
| 2016 | 6.5 | 3 year official |
| 2017 | 6.5 | 3 year official |
| 2018 | 4.9 | 3 year official |
| 2019 | 1.5 | 3 year official |
| 2020 | 0.0 | 3 year official |