Segunda División B

Segunda División B is a football league which is the third division in Spain.
Structure.
The league is made of 4 groups of 20 teams, making the amount of total teams 80 in all.
Promotion.
In each group, the top 6 teams qualify for the Copa Del Rey. The 2nd, 3rd, and 4th placed teams qualify for playoffs to be promoted to Segunda Division. The 1st placed team has to play a playoff with the champions of other groups and the winner is declared champion.
Relegation.
In each group, the bottom 4 teams are directly sent to the Tercera División. The 16th placed teams in each group compete against each other. The worst of those teams is relegated.
Group winners.
These are all the group winners ever. The promoted group winners are in bold.
"Note: Since the 2008-09 season, the champion has been decided in a playoffs round. The winner of the playoffs final is highlighted in gold. The loser of the playoffs final is highlighted in silver."