The levels aimed for have changed over the years.

The level of economic development also changes a lot from one developing countries to another.

Researchers say those levels of sexual activity have not changed significantly since 2002.

The level of support given has changed throughout this period.

The levels of the sea have not changed significantly since Drake's visit.

Contrary to what you say, the general level of illegal drug use has indeed changed in 10 years.

The player's level can also change depending on where in the world the player is.

Under the process, the level at which the caps are set can change rapidly.

But the market researchers say retailers need to look at the way people's lives and levels of tolerance have changed.

Your level of debt doesn't change, just the time point.