Question: What year saw the end of the Sender Freies broadcast service, in the city where Botho Graef was born?

full_context: Document 1: Nordwestdeutscher Rundfunk: Nordwestdeutscher Rundfunk ("Northwest German Broadcasting" - NWDR) was the organization responsible for public broadcasting in the German Länder of Hamburg, Lower Saxony, Schleswig-Holstein and North Rhine-Westphalia from 22 September 1945 to 31 December 1955. Until 1954, it was also responsible for broadcasting in West Berlin. NWDR was a founder member of the consortium of public-law broadcasting institutions of the Federal Republic of Germany, the ARD.
Document 2: Emil Otto Grundmann: Professor Emil Otto Grundmann (1844 in Meissen – 27 August 1890 in Dresden), was a German painter who studied in Antwerp under Baron Hendrik Leys, and in Düsseldorf before moving to America where he became a noted painter. He was the first Director of the School of the Museum of Fine Arts, Boston, an appointment in which Francis Davis Millet, an old Antwerp friend, was instrumental. One of his colleagues at the Museum was Joseph DeCamp.
Document 3: Sender Freies Berlin: Sender Freies Berlin (SFB) () was the ARD public radio and television service for West Berlin from 1 June 1954 until 1990 and for Berlin as a whole from German reunification until 30 April 2003. On 1 May 2003 it merged with Ostdeutscher Rundfunk Brandenburg to form "Rundfunk Berlin-Brandenburg".
Document 4: Conrad Graf: Conrad Graf (17 November 1782 in Riedlingen, Further Austria – 18 March 1851 in Vienna) was an Austrian-German piano maker. His pianos were used by Beethoven, Chopin, and Clara Schumann, among others.
Document 5: Luther W. Graef: Luther W. Graef is the founder of Graef, Anhalt, Schloemer and Associates Inc., former President of American Society of Civil Engineers (ASCE) and the fourth president of ASCE Foundation.
Document 6: Herbert Graf: Herbert Graf (10 April 1903, Vienna5 April 1973, Geneva) was an Austrian-American opera producer. Born in Vienna in 1903, he was the son of Max Graf (1873–1958), and Olga Hönig. His father was an Austrian author, critic, musicologist and member of Sigmund Freud's circle of friends. Herbert Graf was the Little Hans discussed in Freud's 1909 study "Analysis of a Phobia in a Five-year-old Boy".
Document 7: Ostdeutscher Rundfunk Brandenburg: Ostdeutscher Rundfunk Brandenburg (ORB – "East German Broadcasting Brandenburg"), based in Potsdam, was the public broadcaster for the German federal state of Brandenburg from 12 October 1991 until 30 April 2003. It was a member organization of the consortium of public-law broadcasting organizations in Germany, ARD.
Document 8: Botho Graef: Franz Botho Graef (12 October 1857, Berlin – 9 April 1917, Königstein im Taunus) was a German classical archaeologist and art historian. His father was painter Gustav Graef, and his sister, Sabine Lepsius, was also an artist of some note. Graef taught at the University of Jena from 1904 until 1917.
Document 9: Arnold Genthe: Arnold Genthe was born in Berlin, Prussia, to Luise Zober and Hermann Genthe, a professor of Latin and Greek at the Graues Kloster (Grey Monastery) in Berlin. Genthe followed in his father's footsteps, becoming a classically trained scholar; he received a doctorate in philology in 1894 from the University of Jena, where he knew artist Adolf Menzel, his mother's cousin.
Document 10: Germany: After Germany surrendered, the Allies partitioned Berlin and Germany's remaining territory into four military occupation zones. The western sectors, controlled by France, the United Kingdom, and the United States, were merged on 23 May 1949 to form the Federal Republic of Germany (Bundesrepublik Deutschland); on 7 October 1949, the Soviet Zone became the German Democratic Republic (Deutsche Demokratische Republik). They were informally known as West Germany and East Germany. East Germany selected East Berlin as its capital, while West Germany chose Bonn as a provisional capital, to emphasize its stance that the two - state solution was an artificial and temporary status quo.
Document 11: Franz Grashof: Born in Duesseldorf, Germany, as the son of Elisabeth Brüggemann and Karl Grashof, who taught at an upper secondary school, Franz Grashof visited the elementary and lower secondary school in Duesseldorf and the industrial school in Hagen.
Document 12: Schweizer Radio DRS: On 1 January 2011, Schweizer Fernsehen (SF) and Schweizer Radio DRS began the process of merging the two entities into Schweizer Radio und Fernsehen (SRF). On 16 December 2012, the merger was complete, with SF and SR DSR adopting the SRF name to their television and radio stations.
Document 13: German reunification: The German reunification (German: Deutsche Wiedervereinigung) was the process in 1990 in which the German Democratic Republic (GDR / DDR / East Germany) joined the Federal Republic of Germany (FRG / West Germany) to form the reunited nation of Germany, and when Berlin reunited into a single city, as provided by its then Grundgesetz constitution Article 23. The end of the unification process is officially referred to as German unity (German: Deutsche Einheit), celebrated on 3 October (German Unity Day) (German: Tag der deutschen Einheit). Following German reunification, Berlin was once again designated as the capital of united Germany.
Document 14: West Berlin: West Berlin was 100 miles (161 kilometres) east and north of the Inner German border and only accessible by land from West Germany by narrow rail and highway corridors. It consisted of the American, British, and French occupation sectors established in 1945. It was, however, a de facto part of West Germany. It had a special and unique legal status because its administration was formally conducted by the Western Allies. At the same time, East Berlin, de jure occupied and administered by the Soviet Union, was the de facto capital of East Germany. The Berlin Wall, built in 1961, physically separated West Berlin from its East Berlin and East German surroundings until it fell in 1989.
Document 15: Christian Heinrich Grosch: Christian Heinrich Grosch was born in Copenhagen, Denmark. His family moved to Frederikshald (now Halden) in Østfold, Norway during 1811. He was first educated by his father, Heinrich August Grosch (1763-1843) who was a painter, graphic designer and teacher. When The Royal Drawing School was established in Christiania (now Oslo) in 1818, his father gained employment there as an instructor and re-located the family. Christian Heinrich attended the Royal Drawing School from 1819 to 1820. He also studied engineering with instructors including Benoni Aubert and Theodor Broch. In 1824, he completed his training at the Royal Danish Academy of Fine Arts in Copenhagen.
ground_truth: 30 April 2003
sub_queries: What is Botho Graef's birthplace? Answer: Berlin
What year did Sender Freies Berlin end? Answer: 30 April 2003