Unknown—please explain
2007	[List of all countries]
2006	[List of all countries]
2005	[List of all countries]
2004	[List of all countries]
2003	[List of all countries]
2002	[List of all countries]
2001	[List of all countries]
2000	[List of all countries]
1999	[List of all countries]
1998	[List of all countries]
1997	[List of all countries]