Question: Since when has the the country of Greenwich (the one whose area is 5044.18 hectare) been the United Kingdom?
Options:
2006-06-05
1977-09-20
2012-06-19
1922-12-06
1992-08-03
1998
1809-09-05
1718-07-21
2013-01-03
1864-10-31