List of French Open men's doubles champions

Columns: Country | Amateur Era | Open Era | All-time | First title | Last title
South Africa ( RSA ) | 2 | 2 | 4 | 1947 | 1972 | Belarus ( BLR ) | 0 | 4 | 4 | 2005 | 2012 | Canada ( CAN ) | 0 | 4 | 4 | 2007 | 2012 | Switzerland ( SUI ) | 0 | 3 | 3 | 1981 | 1992 | Russia ( RUS ) | 0 | 3 | 3 | 1996 | 2002 | Czech Republic ( CZE ) | 0 | 3 | 3 | 1996 | 2009 | Great Britain ( GBR ) | 2 | 0 | 2 | 1933 | 1933

Example questions:
What is the French Open open era for the country that has the fourth most amount of languages in the world ? | What year was the last French Open title for the country that is the most populous nation in Europe ? | What year was the first French Open title won by the country that the third most populated country in the world ? | What is the French Open amatur era of the country that gained its independence from The Holy Roman Empire in 1648 ? | What year was the last French Open title for the country whose three largest metropolitan areas are Toronto , Montreal , and Vancouver ?

Answers:
2 | 2002 | 1926 | 0 | 2012