Thanks duong for the great statistics. France is definitely a consistent power in tennis, while Spain is a spearhead, even though not all their generations have been great, the ones that were produced several Top 4 players.
In light of the question previously asked, I noticed there is no info in the OP about this, so I added this in the original post to complete the picture about the backgrounds used:
Gray - The player has withdrawn from the tournament, but will incur a 0-point penalty. This will be noted as a -1 in case of ATP 500 events, and 0 in case of ATP 1000. This is due to the fact that ATP 1000 events are recognized as Mandatory by the system, while ATP 500 events are not, and there needs to be a difference between regular 0 (first round loss) and mandatory 0 (penalty).