Seaborne piracy against transport vessels remains a significant issue (with estimated worldwide losses of US$16 billion per year), particularly in the waters between the Red Sea and Indian Ocean, off the Somali coast, and also in the Strait of Malacca and Singapore, which are used by over 50,000 commercial ships a year. In the Gulf of Guinea, maritime piracy has also led to pressure on offshore oil and gas production, providing security for offshore installations and supply vessels is often paid for by oil companies rather than the respective governments. In the late 2000s, the emergence of piracy off the coast of Somalia spurred a multi-national effort led by the United States to patrol the waters near the Horn of Africa. In 2011, Brazil also created an anti-piracy unit on the Amazon River. Sir Peter Blake, a New Zealand world champion yachtsman, was killed by pirates on the Amazon river in 2001.