Question: the 2000 DFB-Pokal Final was played at a stadium originally built in which year ?

Context articles: 1999–2000 DFB-Pokal
1993 DFB-Pokal Final
1985 DFB-Pokal Final
1977 DFB-Pokal Final
2008 DFB-Pokal Final
1973 DFB-Pokal Final
Olympiastadion (Berlin)
2000 DFB-Pokal Final
2001 DFB-Pokal Final
1983 DFB-Pokal Final

The 1999–2000 DFB-Pokal was the 57th season of the annual German football cup competition.
 It began on 31 July 1999 and ended on 6 May 2000.
 In the final Bayern Munich defeated Werder Bremen 3–0 to take their tenth title.
The 1993 DFB-Pokal Final decided the winner of the 1992–93 DFB-Pokal, the 50th season of Germany's premier knockout football cup competition.
 It was played on 12 June 1993 at the Olympiastadion in Berlin.
 Hertha BSC's second team, playing in the third division, made it to the final against Bayer Leverkusen, making it the first and only time a reserve side has made it to the final, as second teams have since been disallowed from entering the competition.
 Leverkusen won the match 1–0 to claim their first cup title.
The 1985 DFB-Pokal Final decided the winner of the 1984–85 DFB-Pokal, the 42nd season of Germany's premier knockout football cup competition.
 It was played on 26 May 1985 at the Olympiastadion in West Berlin.
 Bayer Uerdingen won the match 2–1 against Bayern Munich to claim their first cup title.
 This was Bayern's first cup final loss in their eighth final.
The 1977 DFB-Pokal Final decided the winner of the 1976–77 DFB-Pokal, the 34th season of Germany's knockout football cup competition.
 The original final was played on 28 May 1977 at the Niedersachsenstadion in Hanover.
 The match between Hertha BSC and 1.
 FC Köln finished 1–1 after extra time, requiring a replay two days later.
 On 30 May 1977, once again at the Niedersachsenstadion in Hanover, 1.
 FC Köln won the replay 1–0 to claim their 2nd cup title.
The 2008 DFB-Pokal Final decided the winner of the 2007–08 DFB-Pokal, the 65th season of Germany's premier knockout football cup competition.
 The match took place on 19 April 19, 2008 between thirteen-time winners Bayern München and two-time winners Borussia Dortmund.
 The final was played in front of 70,000 at Berlin's Olympiastadion.
 Bayern ran out 2–1 winners in extra time, thanks to two strikes from Italian forward Luca Toni, gaining their 14th DFB-Pokal title and gaining the first trophy of a league and cup double.
The 1973 DFB-Pokal Final, which decided the winner of the 1972–73 DFB-Pokal, took place on 23 June 1973 between Borussia Mönchengladbach and 1.
 FC Köln in the Rheinstadion in Düsseldorf.
 The sports magazine "kicker" described it as one of the "best, highest energy, and exciting" DFB-Pokal matches ever played.
 It was in this match that Günter Netzer infamously substituted himself on.
 Shortly after this, Netzer scored what would be the winning goal for Borussia.
Olympiastadion (] ) is a sports stadium in Berlin, Germany.
 It was originally built for the 1936 Summer Olympics by Werner March.
 During the Olympics, the record attendance was thought to be over 100,000.
 Today the stadium is part of the Olympiapark Berlin.
The 2000 DFB-Pokal Final decided the winner of the 1999–2000 DFB-Pokal, the 57th season of Germany's premier knockout football cup competition.
 It was played on 6 May 2000 at the Olympiastadion in Berlin.
 Bayern Munich won the match 3–0 against Werder Bremen to claim their 10th cup title.
The 2001 DFB-Pokal Final decided the winner of the 2000–01 DFB-Pokal, the 58th season of Germany's premier knockout football cup competition.
 It was played on 26 May 2001 at the Olympiastadion in Berlin.
 Schalke 04 won the match 2–0 against Union Berlin to claim their 3rd cup title.
The 1983 DFB-Pokal Final decided the winner of the 1982–83 DFB-Pokal, the 40th season of Germany's knockout football cup competition.
 It was played on 11 June 1983, and was the first and to date the only cup final between two teams from the same city, which was contested between Cologne clubs 1.
 FC Köln, playing in the Bundesliga, and Fortuna Köln, playing in the 2.
 Bundesliga.
 Fittingy, the match took place in Cologne, at the Müngersdorfer Stadion.
 1.
 FC Köln won the derby match 1–0 to claim their 4th cup title.