| YEAR | TRACKS REPORTED |
|---|---|
| 2015 | 16 |
| 2014 | 942 |
| 2013 | 971 |
| 2012 | 839 |
| 2011 | 975 |
| 2010 | 1093 |
| 2009 | 1423 |
| 2008 | 1150 |
| 2007 | 1399 |
| 2006 | 1538 |
| 2005 | 1384 |
| 2004 | 1420 |
| 2003 | 1452 |
| 2002 | 1176 |
| 2001 | 1011 |
| 2000 | 961 |
| 1999 | 870 |
| 1998 | 884 |
| 1997 | 652 |
| 1996 | 752 |
| 1995 | 729 |
| 1994 | 664 |
| 1993 | 634 |
| 1992 | 560 |
| 1991 | 632 |
| 1990 | 678 |
| 1989 | 573 |
| 1988 | 605 |
| 1987 | 534 |
| 1986 | 446 |
| 1985 | 468 |
| 1984 | 388 |
| 1983 | 424 |
| 1982 | 414 |
| 1981 | 437 |
| 1980 | 373 |