Which statement best interprets the trend in the national debt since 2004?
The national debt has increased from 2007 to 2009 and from 2015 to 2019.
The national debt has been steadily increasing each year since 2004.
The national debt has been steady or slowly decreasing each year since 2004.
The national debt increased from 2007 to 2009 and has been steady since 2009.