The size of the staff has varied over the years.

The numbers of men in the Company varied over the years.

The water level in the spring has varied over time.

However, the impact of the state was felt through natural forces, and it varied over time.

The reasons have been many and varied over the years.

Yes, rates of growth are going to vary over time.

The age range of those served has also varied over the years, and is now 17 to 21.

The weight of the bar has varied over the years.

The program has varied in length over the course of its run, between two and four hours long at various times.

The components of the game have varied over the years.