The numbers and relative proportions of visitors have changed considerably over the last 40 years.

Oh, yeah, proportion, that thing designers are supposed to change ever so often.

The proportion scarcely changed between 1999 and 1997, the first time Columbia did such a survey.

That proportion would not change significantly over the next two years.

What's more, the proportions of fat and lean tissue may change.

This proportion will change with gas becoming the major energy export in the early 1990s.

Israel says the proportion of water it uses has not changed substantially since the 1950s.

I wonder if the relative proportion of good to bad physicians has really changed such a lot in the last 100 years.

In this election, his aides said, the proportion will likely change.

By 1999, the proportions giving those responses had changed only slightly.