| 1996 | 1997 | 1998 | 1999 | 2000 | 2001 | 2002 | 2003 | ||||
| Adams | 1.5412 | 0.5266 | 0.2642 | 1.5844 | 1.7261 | 0.6158 | 0.8701 | 0.2845 | |||
| Canyon | 7.6301 | 5.7572 | 4.6600 | 4.2028 | 3.9181 | 3.3900 | 3.5177 | 3.2210 | |||
| Gem | 5.9655 | 1.7984 | 3.9060 | 1.9809 | 4.1499 | 3.0358 | 1.6780 | ||||
| Owyhee | 4.9827 | 4.2570 | 2.8282 | 2.0181 | 3.0064 | 1.5443 | 1.7492 | 0.3576 | |||
| Payette | 5.5393 | 3.4189 | 3.2763 | 2.6384 | 3.8391 | 2.3481 | 2.0945 | 2.2361 | |||
| Washington | 5.2105 | 2.4873 | 5.2848 | 2.3305 | 0.9021 | 3.2141 | 2.9222 | 1.2006 | |||