In the mid 1970s there were barely 150 multi-hull ships in service worldwide, of which less than one-third were used as transport vessels.
Phakathi ku1970 kwakukho iinqanawa ezineziqu ezibini eziphindaphindiweyo ezilikhulu elinamashumi amahlanu ngokungaphelelanga ekusebenzeni kwilizwe jikele, apho ngaphantsi kwesiqingatha sesithathu sasetyenziswa njengezithathi zeenqanawa.