| Year | 1991 | | Acres (x 1,000) | 3,952 |
| Year | 1992 | | Acres (x 1,000) | 2,710 |
| Year | 1993 | | Acres (x 1,000) | 1,676 |
| Year | 1994 | | Acres (x 1,000) | 877 |
| Year | 1995 | | Acres (x 1,000) | 1,418 |
| Year | 1996 | | Acres (x 1,000) | 199 |
| Year | 1997 | | Acres (x 1,000) | 49 |
| Year | 1998 | | Acres (x 1,000) | 363 |
| Year | 1999 | | Acres (x 1,000) | 470 |
| Year | 2000 | | Acres (x 1,000) | 1,422 |
| Year | 2001 | | Acres (x 1,000) | 1,982 |
| Year | 2002 | | Acres (x 1,000) | 408 |
| Year | 2003 | | Acres (x 1,000) | 250 |
| Year | 2004 | | Acres (x 1,000) | 174 |
| Year | 2005 | | Acres (x 1,000) | 797 |
| Year | 2006 | | Acres (x 1,000) | 1,303 |
| Year | 2007 | | Acres (x 1,000) | 1,331 |
| Year | 2008 | | Acres (x 1,000) | 1,593 |
| Year | 2009 | | Acres (x 1,000) | 443 |
| Year | 2010 | | Acres (x 1,000) | 1,207 |
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