6/91 2/92 2/92 8/92 4/93 3/94 12/94 2/95 5/96 12/96 11/97 3/98 3/98 3/98 3/99 12/99 3/00 3/00 4/00 4/04 4/04 12/06 4/07 4/10 4/11 4/12 9/12 4/13 4/13 9/13 4/14 9/14 9/16