Dates are from January 2000 to October 2013 (the day the draw for the World Cup groups was made, and thus the rankings that determined the group seeds)
A "confederation" is the continent the team plays in. The red line shows the team's rank within its confederation. For example, a team from Asia may be the best in its confederation but only ranked 30th in the world.
Every July is indicated by a dotted line (the month that major tournaments occur)