Why do iron meteorites represent a much higher percentage of finds than of falls?

Meteorites falls are those which are collected just after knowing it is falling, whereas meteorites find are found at later times.

Iron meteorites have higher percentage of find because people have found that they are useful and have great qualities. They collect such meteorites thus removing them from scientific record.

The iron meteorite consist of iron nickle alloy and is a usable iron source for humans. Iron meteorites are more resistance to weathering and can easily survive atmospheric entry hence are found in large pieces.

Because of all such features, people collect them and make their most of use, hence its find percentage is higher.