Because of the lack of regulation, it is difficult to gauge the scale of the issue.

BBC: 'Ban non-medics from giving Botox'

"Size of Wales" was founded by Welsh environmentalists annoyed that their country was often used in the media as a comparator to gauge the scale of rainforest destruction.

BBC: Charity reaches rainforest goal

In emerging economies the scale of the problem is much harder to gauge.

ECONOMIST: Unemployment

The Purchasing Managers Index, used to gauge manufacturing and economic health on point scale, shows that 2012 will not be a strong year.

FORBES: Higher Copper Output Expected In 2012, Imports Will Slow -- Jones

The scale of human trafficking in the US is hard to gauge, but the National Human Trafficking Resource Center hotline, operated by Polaris Project since December 2007, has received more than 57, 000 calls from every state in the union.

BBC: Twelve arrested in US raid on Latin sex-trafficking ring