| YEAR | TRACKS REPORTED |
|---|---|
| 2018 | 391 |
| 2017 | 1160 |
| 2016 | 1287 |
| 2015 | 1164 |
| 2014 | 1198 |
| 2013 | 1216 |
| 2012 | 1117 |
| 2011 | 1187 |
| 2010 | 1337 |
| 2009 | 1658 |
| 2008 | 1474 |
| 2007 | 1774 |
| 2006 | 1931 |
| 2005 | 1762 |
| 2004 | 1756 |
| 2003 | 1741 |
| 2002 | 1484 |
| 2001 | 1313 |
| 2000 | 1388 |
| 1999 | 1206 |
| 1998 | 1274 |
| 1997 | 1059 |
| 1996 | 1177 |
| 1995 | 1074 |
| 1994 | 941 |
| 1993 | 888 |
| 1992 | 828 |
| 1991 | 883 |
| 1990 | 886 |
| 1989 | 842 |
| 1988 | 783 |
| 1987 | 749 |
| 1986 | 628 |
| 1985 | 660 |
| 1984 | 614 |
| 1983 | 680 |
| 1982 | 643 |
| 1981 | 598 |
| 1980 | 549 |