| YEAR | TRACKS REPORTED |
|---|---|
| 2016 | 871 |
| 2015 | 1033 |
| 2014 | 1103 |
| 2013 | 1130 |
| 2012 | 1042 |
| 2011 | 1141 |
| 2010 | 1281 |
| 2009 | 1577 |
| 2008 | 1349 |
| 2007 | 1676 |
| 2006 | 1847 |
| 2005 | 1696 |
| 2004 | 1670 |
| 2003 | 1662 |
| 2002 | 1393 |
| 2001 | 1208 |
| 2000 | 1254 |
| 1999 | 1101 |
| 1998 | 1132 |
| 1997 | 915 |
| 1996 | 1041 |
| 1995 | 928 |
| 1994 | 866 |
| 1993 | 827 |
| 1992 | 736 |
| 1991 | 792 |
| 1990 | 830 |
| 1989 | 765 |
| 1988 | 735 |
| 1987 | 706 |
| 1986 | 579 |
| 1985 | 617 |
| 1984 | 569 |
| 1983 | 624 |
| 1982 | 581 |
| 1981 | 564 |
| 1980 | 516 |