6u | January 1, 2010 to December 31, 2010 | No limit |
8u | January 1, 2008 to December 31, 2008 | No limit |
10u | January 1, 2006 to December 31, 2006 | No limit |
12u | January 1, 2004 to December 31, 2004 | No limit |
14u | January 1, 2002 to December 31, 2002 | No limit |
16u | January 1, 2000 to December 31, 2000 | No limit |