Table:
text: NFL Europe
Stadiums
Stadiums
Team Stadium Capacity Opened City
Amsterdam Admirals Amsterdam ArenA 51859 1996 Amsterdam , The Netherlands
Amsterdam Admirals Olympisch Stadion 31600 1928 Amsterdam , The Netherlands
Barcelona Dragons Mini Estadi 15276 1982 Barcelona , Spain
Barcelona Dragons Estadi Olímpic Lluís Companys 56000 1929 Barcelona , Spain
Berlin Thunder Olympiastadion 76000 1936 Berlin , Germany
Berlin Thunder F. L. Jahn Sportpark 19500 1951 Berlin , Germany
Cologne Centurions RheinEnergieStadion 50374 1923 Cologne , Germany
Frankfurt Galaxy Commerzbank-Arena Waldstadion (1925–2005) 52000 1925 Frankfurt , Germany
Hamburg Sea Devils AOL Arena 55989 2000 Hamburg , Germany
London/England Monarchs Ashton Gate 21500 1900 Bristol , England

Question: What is the average opening year of the Mini Estadi stadium in Barcelona, Spain under NFL Europe?