how many total governors-general of the union of south africa were there from 1910 to 1961?
10
# Name\n(Birth–Death) Took office Left office Monarch Prime Minister
1 The Viscount Gladstone\n(1854–1930) 31 May 1910 8 September 1914 George V Botha
2 The Viscount Buxton\n(1853–1934) 8 September 1914 17 November 1920 George V Botha
3 HRH Prince Arthur of Connaught\n(1883–1938) 17 November 1920 21 January 1924 George V Smuts
4 The Earl of Athlone\n(1874–1957) 21 January 1924 26 January 1931 George V Smuts
5 The Earl of Clarendon\n(1877–1955) 26 January 1931 5 April 1937 George V Hertzog
6 Sir Patrick Duncan\n(1870–1943) 5 April 1937 17 July 1943 George VI Hertzog
— Nicolaas Jacobus de Wet\n(1873–1960)\n(Officer Administering the Government) 17 July 1943 1 January 1946 George VI Smuts
7 Gideon Brand van Zyl\n(1873–1956) 1 January 1946 1 January 1951 George VI Smuts
8 Ernest George Jansen\n(1881–1959) 1 January 1951 25 November 1959 George VI Malan
— Lucas Cornelius Steyn\n(1903–1976)\n(Officer Administering the Government) 26 November 1959 11 December 1959 Elizabeth II Verwoerd
9 Charles Robberts Swart\n(1894–1982) 11 December 1959 30 April 1961 Elizabeth II Verwoerd
— Lucas Cornelius Steyn\n(1903–1976)\n(Officer Administering the Government) 30 April 1961 31 May 1961 Elizabeth II Verwoerd
csv/203-csv/89.tsv