| Year | Time period | Interest rate |
|---|---|---|
| 2008 | Jan. 1 - March 31 | 7% |
| 2007 | Jan. 1 - June 30 | 8 |
| 2006 | Jan. 1 - June 30 July 1 - Dec. 30 |
7 8 |
| 2005 | Jan. 1 - March 31 April 1 - Sept. 30 Oct. 1 - Dec. 31 |
5 6 7 |
| 2004 | Jan. 1 - March 31 April 1 - June 30 July 1 - Sept. 30 Oct. 1 - Dec. 31 |
4 5 4 5 |