Your numbers have diminished, and they continue to do so, yes?

Only when one got deeper into the desert did their number diminish.

Their numbers have also diminished steadily in the last decade.

And, need I add, their numbers were diminishing with each generation.

And the number of veterans in Congress has been diminishing.

For decades the number of small farms across the country has diminished.

By the turn of the century their numbers had diminished.

Consequently, the number of factors diminished from almost 50 companies just two decades ago to about 15 today.

There were plenty of them still living here, but their numbers diminished each year.

But few thinking people now believe in life after death, and the number of those who do is probably diminishing.