| Year | Distance |
|---|---|
| 1998 | 10,880 |
| 1999 | 10,425 |
| 2000 | 12,113 |
| 2001 | 8,379 |
| 2002 | 13,922 |
| 2003 | 9,096 |
| 2004 | 11,319 |
| 2005 | 8,780 |
| 2006 | 8,611 |
| 2007 | 7,853 |
| 2008 | 8,695 |
| 2009 | 7,360 |
| 2010 | 5,852 |
| 2011 | 4,959 |
| 2012 | 8,461 |
| 2013 | 9,693 |
| 2014 | 5,452 |
| 2015 | 4,528 |
| 2016 | 7,736 |
| 2017 | 6,267 |
| 2018 | 4,257 |
| Total | 174,638 |