11.   Several of the determinants of the demand for physician services have complicated the picture by dramatically changing over the last two Decades.

12.   The average cheetah will change over the centuries, just like the mean annual rainfall changes.

13.   The real point is that competition for the region has changed over the past quarter century from military to economic.

14.   They provide a visual representation of how performance is changing over time.

15.   They were found to require continual maintenance as the support environment for specific products changed over time.

16.   Thus what was considered immoral conduct has varied from place to place, and the definition has changed over time.

17.   We have to attend to the dynamic tension between constitutional theory and political practice, and to change over time.

18.   We might also note that what constitutes an offence in legal terms also changes over time.

19.   The social significance of religion has changed over time.