Blame Jimmuh and Clinton for wet foot-dry foot.
There was a drop in 2002 - 2003, but probably not from 9/11. 2004 levels approached the 2001 mark.
Maritime Migrant flow from Cuba:
FY2000 - 2811
FY2001 - 3277
FY2002 - 2119
FY2003 - 2823
FY2004 - 3082
Even so, the amount of Cubans getting here by means of studebakers, pickups on tires, and inner tubes has decreased SEVERELY since 9-11.
I was mistaken about Clinton with wet foot-dry foot, but I do believe the Mariel Boatlift happened under the watch of Jimmuh.