I doubt there will ever be a post-1977 Spain TL but here goes the OTL results:
1977 GE:
Green - Centre, Red - Socialist, Orange - Catalan nationalist right, Dark Green - Basque nationalist right
1979 GE:
Blue - Centre, Red - Socialist, Green - Basque nationalist right
1982 GE, after the UCD's great blunder:
Red - Socialist, Blue - Right, Green - Basque nationalist right, Orange - Catalan nationalist right
1986 GE:
Red - Socialist, Blue - Right, Green - Basque nationalist right, Orange - Catalan nationalist right, Pink - Centre
1989 GE:
Red - Socialist, Blue - Right, Orange - Catalan nationalist right, Green - Basque nationalist right, Pink - Basque nationalist left
1993 GE:
Red - Socialist, Blue - Right, Orange - Catalan nationalist right, Green - Basque nationalist right
1996 GE:
Blue - Right, Red - Socialist, Orange - Catalan nationalist right, Green - Basque nationalist right
2000 GE:
Blue - Right, Red - Socialist, Orange - Catalan nationalist right, Green - Basque nationalist right
2004 GE:
Red - Socialist, Blue - Right, Green - Basque nationalist right
2008 GE:
Red - Socialist, Blue - Right
2011 GE:
Blue - Right, Red - Socialist, Orange - Catalan nationalist right, Green - Basque nationalist right, Dark Green - Basque nationalist left