| Year | 1/20 oz | 1/10 oz | 1/4 oz | 1/2 oz | 1 oz |
| 1981 | 0 | 0 | 313,000 | 193,000 | 596,000 |
| 1991 | 10,000 | 10,000 | 10,000 | 10,000 | 109,193 |
| 1992 | 63,858 | 50,592 | 27,321 | 24,343 | 46,281 |
| 1993 | 10,000 | 10,000 | 2,500 | 2,500 | 73,881 |
| 1994 | 10,000 | 10,000 | 2,500 | 2,500 | 1,000 |
| 2000 | 5,300 | 3,500 | 2,500 | 1,500 | 2,370 |
| 2001 | 0 | 0 | 0 | 0 | 0 |
| 2002 | 5,000 | 5,000 | 5,000 | 5,000 | 15,000 |
| 2003 | 800 | 300 | 300 | 300 | 500 |
| 2004 | 4,000 | 2,000 | 1,500 | 500 | 3,000 |
| 2005 | 3,200 | 500 | 500 | 500 | 3,000 |
| 2006 | 3,000 | 4,000 | 1,500 | 500 | 4,000 |
| 2007 | 1,200 | 1,200 | 500 | 500 | 2,500 |
| 2008 | 800 | 2,500 | 800 | 300 | 800 |
| 2009 | 2,000 | 9,000 | 3,000 | 3,000 | 6,200 |
| 2010 | 1,500 | 4,500 | 1,500 | 1,500 | 4,000 |
| 2011 | 2,500 | 6,500 | 1,500 | 1,500 | 3,000 |
| 2012 | 0 | 0 | 0 | 0 | 3,000 |
| 2013 | 650 | 2,150 | 750 | 500 | 2,350 |
| 2014 | 1,050 | 2,450 | 1,000 | 1,000 | 4,050 |
| 2015 | 1,300 | 4,100 | 1,300 | 1,100 | 4,800 |
| 2016 | 2,900 | 3,800 | 1,000 | 1,200 | 4,100 |
| 2017 | 1,000 | 300 | 500 | 700 | 900 |
| 2018 | 2,500 | 1,500 | 1,250 | 1,250 | 2,050 |
| 2019 | 1,500 | 1,250 | 1,500 | 1,500 | 2,000 |
| 2020 | 700 | 700 | 700 | 700 | 1,100 |
| 2021 | 1,000 | 850 | 500 | 500 | 1,050 |
| 2022 | 1,100 | 1,400 | 1,300 | 1,000 | 1,900 |
| 2023 | 2,000 | 1,750 | 1,000 | 1,000 | 1,500 |
| 2024 | 3,500 | 3,500 | 2,200 | 2,200 | 3,000 |
| 2025 | 0 | 0 | 0 | 0 | 0 |