| Year | # | Awarded |
|---|---|---|
| 1989 | 19 | $ 15,000 |
| 1990 | 25 | $ 16,000 |
| 1991 | 28 | $ 10,000 |
| 1992 | 25 | $ 9,800 |
| 1993 | 21 | $ 8,400 |
| 1994 | 14 | $ 6,500 |
| 1995 | 30 | $ 10,500 |
| 1996 | 38 | $ 19,000 |
| 1997 | 51 | $ 20,500 |
| 1998 | 47 | $ 23,500 |
| 1999 | 41 | $ 26,600 |
| 2000 | 60 | $ 30,000 |
| 2001 | 78 | $ 39,000 |
| 2002 | 58 | $ 29,000 |
| 2003 | 67 | $ 46,900 |
| 2004 | 71 | $ 56,800 |
| 2005 | 79 | $ 63,200 |
| 2006 | 95 | $ 76,000 |
| 2007 | 79 | $ 71,100 |
| 2008 | ||
| 2009 | ||
| 2010 | ||
| 2011 | ||
| 2012 | ||
| 2013 | ||
| 2014 | ||
| 2015 | ||
| 2016 | ||
| 826 | $ 577,800 |