Attendance was up 14 percent at the 2011 Miami International Boat Show, which closed Monday. The National Marine Manufacturers Association, which produces the show, reported 104,168 attendees this year, versus 91,415 in 2010. Strictly Sail Miami, however, was down 8 percent compared with 2009 -the last time it was held as a stand-alone show. A total of 18,122 people attended Strictly Sail, versus 19,723 two years ago. “The atmosphere throughout the five-day event was positive, and exhibitors from both shows reported strong buying crowds.