Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Title | Genre | Sub­divisions | Libretto | Première date | Place, theatre |
| --- | --- | --- | --- | --- | --- |
| Mahomed's Paradies | Burleske-Operette | 1 act | Composer | 26 February 1866 | Vienna, Harmonietheater |
| Das Orakel zu Delfi | Burleske-Operette | 2 acts | Carl Costa | 21 September 1872 | Linz, Landestheater |
| Cleopatra, oder Durch drei Jahrtausende (together with: Richard Genée and Max von Weinzierl) | fantastic burlesque | 3 sections | J. Steinher | 13 November 1875 | Vienna, Komische Oper |
| König Jérôme oder Immer lustick! | Operette | 4 acts | Adolf Schirmer | 28 November 1878 | Vienna, Ringtheater |
| Der kleine Don Juan | Operette |  |  | November 1879 | Budapest, Deutsches Theater |
| Wiener Kinder | Operette | 3 acts | Leopold Krenn and Carl Wolff | 19 January 1881 | Vienna, Carltheater |
| Ein Deutschmeister | Operette | 3 acts | Richard Genée and Bruno Zappert | 30 November 1888 | Vienna, Carltheater |
| Wiener Luft | Posse mit Gesang | 3 acts | Benno Rauchenegger | 10 May 1889 | Vienna, Theater an der Wien |
| Der bleiche Zauberer | indianisches Lagerbild | 1 act | Isidor Fuchs, based on an Indian story by James Fennimore Cooper | 20 September 1890 | Vienna, Theater an der Wien |
| Der schöne Rigo | Operette | 2 acts | Leopold Krenn and Carl Lindau | 24 May 1898 | Vienna, 'Sommertheater Venedig in Wien' |
| Die Landstreicher | Operette | Prologue and 2 acts | Leopold Krenn and Carl Lindau | 26 July 1899 | Vienna, 'Sommertheater Venedig in Wien' |
| Die drei Wünsche | Operette | Prologue and 3 acts | Leopold Krenn and Carl Lindau | 9 March 1901 | Vienna, Carltheater |
| Der Fremdenführer | Operette | Prologue and 3 acts | Leopold Krenn and Carl Lindau | 11 October 1902 | Vienna, Theater an der Wien |
| Der Schätzmeister | Operette | 3 acts | Alexander Engel and Julius Horst | 10 December 1904 | Vienna, Carltheater |
| Fesche Geister | Operette | Prologue and 2 sections | Leopold Krenn and Carl Lindau | 7 July 1905 | Vienna, 'Sommertheater Venedig in Wien' |
| Über'n großen Teich (together with: Edmund Eysler, Bela von Ujj and F. Ziegler) | Operette |  | Adolph Philipp | 2 September 1906 | Vienna, Theater an der Wien |
| Die Spottvogelwirtin |  | 3 acts | Rudolf Oesterreicher | 1906 | Vienna |
| Ein tolles Mädel (English: Mlle Mischief) | Vaudeville-Operette | Prologue and 2 acts | Wilhelm Sterk (after: Kurt Kraatz and Heinrich Stobitzer) (English: Sydney Rosenfeld) | 24 August 1907, English version: 28 September 1908 | Wiesbaden; English version: New York City, Lyric Theatre; |
| Am Lido | Operette | 1 act | Ottokar Tann-Bergler and Alfred Deutsch-German | 31 August 1907 | Vienna, Kolosseum |
| Der Liebeswalzer | Operette | 3 acts | Robert Bodanzky and Fritz Grünbaum | 24 October 1908 | Vienna, Raimund Theater |
| Herr und Frau Biedermeier | Singspiel | 1 act | Wilhelm Sterk | 9 January 1909 | Munich, 'Kleine Bühne' |
| Die Gaukler | Operette | 1 act | Emil Golz and Arnold Golz | 6 September 1909 | Vienna, Apollotheater |
| Ball bei Hof | Operette | 3 acts | Wilhelm Sterk (after the comedy "Hofgunst" by Thilo von Trotha) | 22 January 1911 | Stettin, Stadttheater |
| In fünfzig Jahren — "Zukunftstraum einer Küchenfee" | Burleske-Operette | 2 acts | Leopold Krenn and Carl Lindau | 13 January 1911 | Vienna, Ronacher |
| Manöverkinder | Operette | 2 acts | Oskar Friedmann and Fritz Lunzer | 22 June 1912 | Vienna, Sommerbühne 'Kaisergarten' |
| Der Husarengeneral (new version of Manöverkinder) | Operette | 3 acts | Oskar Friedmann and Fritz Lunzer | 3 October 1913 | Vienna, Raimund Theater |
| Fürst Casimir | Operette | 3 acts | Max Neal and Max Ferner | 13 September 1913 | Vienna, Carltheater |
| Das dumme Herz | Operette | 3 acts | Rudolf Oesterreicher and Wilhelm Sterk | 27 February 1914 | Vienna, Johann Strauss-Theater |
| Der Kriegsberichterstatter (together with: Edmund Eysler, Bruno Granichstaedten, Oskar Nedbal, Charles Weinberger) | Operette | 8 scenes | Rudolf Oesterreicher and Wilhelm Sterk | (1914) |  |
| Im siebenten Himmel | Operette | 3 acts | Max Neal and Max Ferner | 26 February 1916 | Munich, Theater am Gärtnerplatz |
| Deutschmeisterkapelle | Operette |  | Hubert Marischka and Rudolf Oesterreicher | 30 May 1958 | Vienna, Raimund Theater |
| Die verliebte Eskadron | Operette | 3 acts | Wilhelm Sterk (after B. Buchbinder) | 11 July 1930 | Vienna, Johann-Strauß-Theater |
Question:
which year did he release his last operetta?
Answer:
1930