<image>Below is a statistical chart showing the output value of a factory from 2000 to 2005.

(1) The average output value over these four years is ____ ten thousand yuan.
(2) The output value in 2002 decreased by ____% compared to that in 2000. (Keep one decimal place before the percent sign)
(3) From an overall analysis, the output value of this factory shows a ____ trend.