div.na,
div.not_applicable {
  background:url(../image/na.svg) no-repeat center center;
}
div.increase.sig {
  background:url(../image/up_arrow_sig.php) no-repeat center center;
}
div.increase.notsig {
  background:url(../image/up_arrow.php) no-repeat center center;
}
div.increase.nostat {
  background:url(../image/up_arrow_nostat.php) no-repeat center center;
}
div.no_change.sig {
  background:url(../image/no_change_sig.php) no-repeat center center;
}
div.no_change.notsig {
  background:url(../image/no_change.php) no-repeat center center;
}
div.no_change.nostat {
  background:url(../image/no_change_nostat.php) no-repeat center center;
}
div.decrease.sig {
  background:url(../image/down_arrow_sig.php) no-repeat center center;
}
div.decrease.notsig {
  background:url(../image/down_arrow.php) no-repeat center center;
}
div.decrease.nostat {
  background:url(../image/down_arrow_nostat.php) no-repeat center center;
}