Year Percent Change 1996-01-01 20.713830367178700 1997-01-01 24.044096629989000 1998-01-01 15.844942647571300 1999-01-01 8.026124728283470 2000-01-01 5.343897727916740 2001-01-01 1.008386345718470 2002-01-01 1.305411221120130 2003-01-01 0.354350094576180 2004-01-01 -2.348255793540240 2005-01-01 -0.668124765940026 2006-01-01 3.104275659099660 2007-01-01 4.442920130859120 2008-01-01 7.931607283834250 2009-01-01 3.966930300783120 2010-01-01 2.774512599158320