Question: Since what year has the anthem which gradually supplanted the Sturmlied as the de facto anthem of the SA been banned in Germany?

full_context: Document 1: Sei gesegnet ohne Ende: "Sei gesegnet ohne Ende" (English translation: "Be Blessed Without End"), also known as the ″Kernstock-Hymne″, is a German language song that was the national anthem of Austria from 1929 until 1938. Written by Ottokar Kernstock, it was sung to the famous tune of "Gott erhalte Franz den Kaiser" by Joseph Haydn that is also used for the "Deutschlandlied", since 1922 the national anthem of Germany.
Document 2: Ich hab' mich ergeben: Ich hab′ mich ergeben, originally titled "Gelübde" ("Vow"), is a patriotic German song. The text was written in 1820 by Hans Ferdinand Maßmann. It was one of the unofficial national anthems of West Germany between 1949 and 1952 when the Deutschlandlied was officially reinstalled.
Document 3: Sturmmann: Sturmmann (] , "storm man") was a Nazi Party paramilitary rank that was first created in the year 1921. The rank of "Sturmmann" was used by the "Sturmabteilung" (SA) and the "Schutzstaffel" (SS).
Document 4: Sturm-Zigaretten: Sturm-Zigaretten (Storm Cigarettes or Assault Cigarettes) was a brand of cigarettes sold to generate funds for the Nazi Party's Sturmabteilung (SA). SA member Otto Wagener had persuaded manufacturers Trommler, based in Dresden to produce Sturm cigarettes, with a share of the profits being given to the SA. The Sturm cigarette factory produced four brands in total: Trommler, Alarm, Sturm and Neue Front. Through this scheme, a typical SA unit earned hundreds of Reichsmarks each month. There is evidence that coercion was used to promote the sale of these cigarettes. SA members were expected to smoke Sturm cigarettes exclusively. The brand was also used to make the prospect of serving in the German army more appealing, with sets of cards being produced which depicted attractive army uniforms from history. The SA stopped manufacturing cigarettes in 1934.
Document 5: Horst-Wessel-Lied: "Horst-Wessel-Lied " (English: "The Horst Wessel Song" ; ] ), also known by its opening words, "Die Fahne hoch " ("The Flag on High"), was used as the anthem of the Nazi Party from 1930 to 1945. From 1933 to 1945 the Nazis made it the national anthem of Germany, along with the first stanza of the "Deutschlandlied". Since 1991, the anthem has been banned in Germany.
Document 6: Act on National Flag and Anthem: The Act on National Flag and Anthem (国旗及び国歌に関する法律 , Kokki Oyobi Kokka ni Kansuru Hōritsu ) (abbreviated as 国旗国歌法 ) is a law that formally established Japan's national flag and anthem. Before its ratification on August 13, 1999, there was no official flag or anthem for Japan. The "nisshōki" (日章旗 ) flag, commonly referred to as the "hinomaru" (日の丸 ) , had represented Japan unofficially since 1870; "Kimigayo" (君が代 ) had been used as Japan's "de facto" anthem since 1880.
Document 7: Lied der Partei: The "Song of the Party" (German: "das Lied der Partei" ), also known as "Die Partei hat immer recht" (English: The Party is always right ) was the party song of the Socialist Unity Party of Germany, the ruling party of East Germany. It was written by Louis Fürnberg. It is best known by the first line of its chorus: "Die Partei, die Partei, die hat immer recht " (English: The Party, the Party, is always right ).
Document 8: Anthems in Animal Farm: George Orwell's allegorical novel "Animal Farm" contains various anthems adopted by the eponymous farm, most notably the original anthem "Beasts of England" and its later replacement "Comrade Napoleon".
Document 9: March of Ukrainian Nationalists: The March of Ukrainian Nationalists is a Ukrainian patriotic song that was originally the official anthem of the Organization of Ukrainian Nationalists and the Ukrainian Insurgent Army. The song is also known by its first line "We were born in a great hour" (Ukrainian: Зродились ми великої години ). The song, written by to music by in 1929, was officially adopted by the leadership of the Organization of Ukrainian Nationalists in 1932. The song is often referred to as a patriotic song from the times of the uprising, and a Ukrainian folk song. It is still commonly performed today, especially at events honoring the Ukrainian Insurgent Army and by nationalist organizations and party meetings, such as those of VO Svoboda.
Document 10: Sturmlied: The Sturmlied ("Storm Song" or "Assault Song") was the de facto anthem of the SA until it was gradually supplanted by the Horst-Wessel-Lied.
Document 11: Sturmabteilung: The Sturmabteilung (SA; ] ), literally Storm Detachment, functioned as the original paramilitary wing of the Nazi Party (NSDAP).
Document 12: Rufst du, mein Vaterland: "Rufst du, mein Vaterland" is the former national anthem of Switzerland. It had semi-official status as the national anthem from the 1850s to 1961, when it was replaced by the Swiss Psalm.
Document 13: Giovinezza: "Giovinezza" (] ; Italian for "youth") is the official hymn of the Italian National Fascist Party, regime, and army, and was the unofficial national anthem of Italy between 1924 and 1943. Although often sung with the official national anthem Marcia Reale, some sources consider Giovinezza to have supplanted the Royal March as the "de facto" national anthem ("Inno della Patria") of Italy, to the dismay of Victor Emmanuel III of Italy—a powerful symbol of the diarchy between the King and Mussolini. It was subsequently the official anthem of the Italian Social Republic.
Document 14: Deutschlandlied: The "Deutschlandlied " (English: "Song of Germany", ] ; also known as "Das Lied der Deutschen " or "The Song of the Germans"), or part of it, has been the national anthem of Germany since 1922, except in East Germany, whose anthem was "Auferstanden aus Ruinen" ("Risen from Ruins") from 1949 to 1990.
Document 15: National anthem of Russia: The State Anthem of the Russian Federation (Russian: Госуда́рственный гимн Росси́йской Федера́ции , "Gosudárstvennyj gimn Rossíjskoj Federácii"; ] ) is the name of the official national anthem of Russia. Its musical composition and some of its lyrics were adopted from the State Anthem of the Soviet Union, composed by Alexander Alexandrov, and lyricists Sergey Mikhalkov and Gabriel El-Registan. The Soviet anthem was used from 1944, replacing "The Internationale" with a more Sovietcentric and Russiacentric song. The anthem had no lyrics after 1956, due to the original lyrics having references to former leader Joseph Stalin. New lyrics were introduced in 1977 by Mikhalkov with lyrics placing less emphasis on World War II and more on the victory of communism.
ground_truth: 1991