Simplify the following text for a Grade 5 native English-speaking person.
Original: Officially , the decade with the most Category 5 hurricanes is 2000 â `` 2009 , with eight Category 5 hurricanes having occurred : Isabel ( 2003 ) , Ivan ( 2004 ) , Emily ( 2005 ) , Katrina ( 2005 ) , Rita ( 2005 ) , Wilma ( 2005 ) , Dean ( 2007 ) , and Felix ( 2007 ) . The previous decade with the most Category 5 hurricanes was the 1960s , with six occurring between 1960 and 1969 .
Simplified: The season with the most Category 5 hurricanes was in 2005 , which had four .