The nationwide count totaled 750 last week, the Houston-based maker of oil tools said.

A year ago, the count totaled 860.

A year ago, the count totaled 954.

A year ago, the count totaled 883.

A year ago, the count totaled 731, the Houston-based maker of oil tools said.

A year ago, the count totaled 897.

The count totaled 672 a year ago, the oil toolmaker said.

A partial count in 1998 totalled over 400 appearances.

A year ago, the count totaled 978.

The count totaled 757 one year ago.