How to tell when a map went out-of-date

When ability of Catholicgauze which surprises many is my skill in telling when a map was made by studying boundaries and country names. The trick is merely knowing when geopolitical changes occurred. A quick cheat sheet can help anyone know what time period their map was made.

• May 1990: North and South Yemen merge
• October 1990: There is only one Germany
• December 1991: Soviet Union breaks up
• During 1992: Yugoslavia breaks up
• January 1993: Czechoslovakia dissolves
• April 1994: White rule over and racial homelands are dissolved in South Africa
• May 1997: Zaire becomes the Democratic Republic of the Congo
• July 2000: Yemen's current border with Saudi Arabia officially agreed upon
• May 2002: East Timor becomes independent
• June 2006: Montenegro separates from Serbia
• February 2008: Kosovo becomes independent (not universally recognized)

By using these dates and finding what changes are shown it should be easy to tell when a "recent" map was made.