[["", "3/31/2007", "3/31/2008", "3/31/2009", "3/31/2010", "3/31/2011", "3/31/2012"], ["abiomed inc", "100", "96.19", "35.87", "75.55", "106.37", "162.45"], ["nasdaq composite index", "100", "94.11", "63.12", "99.02", "114.84", "127.66"], ["nasdaq medical equipment sic code 3840-3849", "100", "82.91", "41.56", "77.93", "94.54", "74.40"]]