When it comes to lamb and mutton, Australia and New Zealand easily top the list both in terms of production and consumption. New Zealanders are the world's leading consumers, closely followed by Australians.
Elsevier Food International, Vol. 6, Number 3, September 2003

Both countries, however, registered slight falls in 2001, with New Zealand posting a fall of nearly five kilos per capita consumption from 22.7 kg in 1999 to 18.4 kg in 2001. Australia is also the world's largest exporter of mutton while New Zealand is the largest exporter of lamb. Per capita consumption in Arab countries, particularly Saudi Arabia, is also significant, as mutton is the preferred and traditional meat.
But disparities in lamb and mutton consumption worldwide are also vast. In Europe, the Greeks lead the ranking, with lamb and mutton consumption of 14.7 kg, more than twice that of the runners-up, the Irish. Over the past five years, lamb and mutton uptake has been stable in Western Europe, although declining in 2001 in some countries due to the FMD (foot-and-mouth disease) crisis. Consumption in Eastern Europe is low, except in Bulgaria and Romania, and even in these markets, demand has been decreasing steadily. Elsewhere, consumers in the US eat little sheep meat, registering at only 0.4kg of mutton and lamb per year, while current Chinese domestic consumption is roughly double what it was ten years ago.