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:
| Entered office | Left office | Party | Election | Coalition |
| --- | --- | --- | --- | --- |
| 4 January 1917 | 25 February 1920 | Home Rule Party | 1916 | HP—OIP— PP |
| 25 February 1920 | 7 March 1922 | Home Rule Party | 1919 | HP—others |
| 7 March 1922 | 22 March 1924 | Old Independence Party | 1919 | OIP—others |
| 7 March 1922 | 22 March 1924 | Old Independence Party | 1923 | OIP—others |
| 22 March 1924 | 23 June 1926 | Conservative Party | 1923 | CP |
| 23 June 1926 | 8 July 1926 | Conservative Party | 1923 | CP |
| 8 July 1926 | 28 August 1927 | Conservative Party | 1923 | CP |
| 28 August 1927 | 3 June 1932 | Progressive Party | 1927 | PP |
| 28 August 1927 | 3 June 1932 | Progressive Party | 1931 | PP |
| 3 June 1932 | 28 July 1934 | Progressive Party | 1931 | PP — IP —Peasants |
| 3 June 1932 | 28 July 1934 | Progressive Party | 1933 | PP — IP —Peasants |
| 28 July 1934 | 2 April 1938 | Progressive Party | 1934 | PP — SDP |
| 2 April 1938 | 17 April 1939 | Progressive Party | 1937 | PP |
| 17 April 1939 | 18 November 1941 | Progressive Party | 1937 | PP — IP — SDP |
| 18 November 1941 | 16 May 1942 | Progressive Party | 1937 | PP — IP — SDP |
| 16 May 1942 | 16 December 1942 | Independence Party | Jul. 1942 | IP |
| 16 May 1942 | 16 December 1942 | Independence Party | Oct. 1942 | IP |
| 16 December 1942 | 21 October 1944 | Independent | Oct. 1942 | — |
| 21 October 1944 | 4 February 1947 | Independence Party | Oct. 1942 | IP — SDP — SP |
| 21 October 1944 | 4 February 1947 | Independence Party | 1946 | IP — SDP — SP |
| 4 February 1947 | 6 December 1949 | Social Democratic Party | 1946 | SDP — IP — PP |
| 6 December 1949 | 14 March 1950 | Independence Party | 1949 | IP |
| 14 March 1950 | 11 September 1953 | Progressive Party | 1949 | PP — IP |
| 11 September 1953 | 24 July 1956 | Independence Party | 1953 | IP — PP |
| 24 July 1956 | 23 December 1958 | Alliance Progressive Party | 1956 | Alliance PP — SDP — PA |
| 23 December 1958 | 20 November 1959 | Social Democratic Party | Jun. 1959 | SDP |
| 20 November 1959 | 8 September 1961 | Independence Party | Oct. 1959 | IP — SDP |
| 8 September 1961 | 31 December 1961 | Independence Party | Oct. 1959 | IP — SDP |
| 1 January 1962 | 14 November 1963 | Independence Party | Oct. 1959 | IP — SDP |
| 14 November 1963 | 10 July 1970 | Independence Party | 1963 | IP — SDP |
| 14 November 1963 | 10 July 1970 | Independence Party | 1967 | IP — SDP |
| 10 July 1970 | 14 July 1971 | Independence Party | 1967 | IP — SDP |
| 14 July 1971 | 28 August 1974 | Progressive Party | 1971 | PP — PA — LL |
| 28 August 1974 | 1 September 1978 | Independence Party | 1974 | IP — PP |
| 1 September 1978 | 15 October 1979 | Progressive Party | 1978 | PP — PA |
| 15 October 1979 | 8 February 1980 | Social Democratic Party | 1979 | SDP |
| 8 February 1980 | 26 May 1983 | Independence Party | 1979 | Gunnar's Independents — PP — PA |
| 26 May 1983 | 8 July 1987 | Progressive Party | 1983 | PP — IP |
| 8 July 1987 | 28 September 1988 | Independence Party | 1987 | IP — PP — SDP |
| 28 September 1988 | 10 September 1989 | Progressive Party | 1987 | PP — SDP — PA |
| 10 September 1989 | 30 April 1991 | Progressive Party | 1987 | PP — SDP — PA — CiP |
| 30 April 1991 | 23 April 1995 | Independence Party | 1991 | IP — SDP |
| 23 April 1995 | 28 May 1999 | Independence Party | 1995 | IP — PP |
| 28 May 1999 | 23 May 2003 | Independence Party | 1999 | IP — PP |
| 23 May 2003 | 15 September 2004 | Independence Party | 2003 | IP — PP |
| 15 September 2004 | 15 June 2006 | Progressive Party | 2003 | PP — IP |
| 15 June 2006 | 24 May 2007 | Independence Party | 2003 | IP — PP |
| 24 May 2007 | 1 February 2009 | Independence Party | 2007 | IP — SDA |
| 1 February 2009 | 10 May 2009 | Social Democratic Alliance | 2007 | SDA — LGM |
| 10 May 2009 | 23 May 2013 | Social Democratic Alliance | 2009 | SDA — LGM |
| 23 May 2013 | Incumbent | Progressive Party | 2013 | PP — IP |
Question:
When did the party elected in jun. 1959 enter office?
Answer:
23 December 1958