Question: During which years was the British statesman, for which Knox Cunningham was Parliamentary Private Secretary, Prime Minister of the United Kingdom?

full_context: Document 1: Anthony Eden: Robert Anthony Eden, 1st Earl of Avon, (12 June 1897 – 14 January 1977) was a British Conservative politician who served three periods as Foreign Secretary and then a relatively brief term as Prime Minister of the United Kingdom from 1955 to 1957.
Document 2: Knox Cunningham: Sir Samuel Knox Cunningham, 1st Baronet, QC (3 April 1909 – 29 July 1976) was a Northern Irish barrister, businessman and politician. As an Ulster Unionist politician at a time when the Unionists were part of the Conservative Party, he was also a significant figure in United Kingdom politics as Parliamentary Private Secretary to Harold Macmillan. His nephew was Sir Josias Cunningham.
Document 3: Conservative government, 1957–1964: The Conservative government of the United Kingdom that began in 1957 and ended in 1964 consisted of three ministries: the first Macmillan ministry, second Macmillan ministry, and then the Douglas-Home ministry. They were led by Harold Macmillan and Sir Alec Douglas-Home, who were appointed respectively by Queen Elizabeth II.
Document 4: Timothy Bligh: Sir Timothy James Bligh, KBE, DSO, DSC* (2 September 1918 – 12 March 1969) was a British naval officer, civil servant and business executive, who served as Principal Private Secretary to two successive prime ministers, Harold Macmillan and Sir Alec Douglas-Home
Document 5: Winston Churchill: Sir Winston Leonard Spencer-Churchill, {'1': ", '2': ", '3': ", '4': "} (30 November 187424 January 1965) was a British statesman, army officer, and writer. He served as Prime Minister of the United Kingdom from 1940 to 1945 and again from 1951 to 1955. As a Member of Parliament (MP), he represented five constituencies over the course of his career. As Prime Minister, Churchill led Britain to victory during World War II. He led the Conservative Party for fifteen years from 1940 to 1955.
Document 6: Supermac (cartoon): "Super-Mac" was a 1958 cartoon image of Harold Macmillan, which became an enduring nickname for him.
Document 7: Keith Joseph: Keith Sinjohn Joseph, Baron Joseph, (17 January 1918 – 10 December 1994), known as Sir Keith Joseph, 2nd Baronet, for most of his political life, was a British barrister and politician. A member of the Conservative Party, he served in the Cabinet under four prime ministers: Harold Macmillan, Sir Alec Douglas-Home, Edward Heath and Margaret Thatcher. He was a key influence in the creation of what came to be known as "Thatcherism" and the subsequent decline of one-nation conservatism and the postwar consensus.
Document 8: Cunningham of Drumquhassle: The Cunninghams of Drumquhassle were a family of the landed gentry in Scotland from the early 16th century to the mid-17th. They are linked to the Cunninghams of Kilmaurs in Ayrshire, being descended through junior lines via the Cunninghams of Polmaise. At their greatest extent, their lands included Mugdock-Mitchell and the house at Killermont (in modern-day Bearsden), covering the part of parishes of Strathblane and New Kilpatrick. John Cunningham, the third laird held several positions of responsibility within the Scottish court, including Master of the Royal Household for James VI and a Collector General of tax during the regency of the Earl of Lennox, but his involvement in the power struggles between the Scottish nobility and the court of Elizabeth I of England also led to his demise and he was executed for treason in 1585. Over the next century, the family lost its land and power – in the mid-17th century, the Cunninghams sold their country house in Drumquhassle in rural Stirlingshire and it passed to the Govane family.
Document 9: John Major: Sir John Major, {'1': ", '2': ", '3': ", '4': "} (born 29 March 1943) is a British politician who was Prime Minister of the United Kingdom and Leader of the Conservative Party from 1990 to 1997. He served as Foreign Secretary and then Chancellor of the Exchequer in the Thatcher Government from 1989 to 1990, and was the Member of Parliament (MP) for Huntingdon from 1979 until he retired in 2001. Since Margaret Thatcher's death in 2013, he is the oldest living former Prime Minister.
Document 10: Sir David Cunningham, 1st Baronet, of Robertland: Sir David Cunningham, 1st Baronet of Robertland was the grandson of David Cunninghame of Robertland, Master of Work to the Crown of Scotland for King James VI of Scotland. He was, by King Charles I, created a Baronet of Nova Scotia on 25 November 1630, by Letters Patent to him and his heirs male whatsoever.
Document 11: Sir William Mount, 1st Baronet: Sir William Arthur Mount, 1st Baronet CBE (Hartley, Hampshire, 3 August 1866 – 8 December 1930) was a British Conservative Party politician and Member of Parliament for the Newbury constituency. He is the great-grandfather of Conservative politician David Cameron, who was Prime Minister of the United Kingdom from 2010 to 2016.
Document 12: Sir Fitzroy Maclean, 1st Baronet: Sir Fitzroy Hew Royle Maclean, 1st Baronet, {'1': ", '2': ", '3': ", '4': "} (11 March 1911 – 15 June 1996) was a Scottish soldier, writer and politician. He was a Unionist Member of Parliament from 1941 to 1974 and was one of only two men who during the Second World War enlisted in the British Army as a private and rose to the rank of brigadier, the other being future fellow Conservative MP Enoch Powell.
Document 13: Harold Macmillan: Maurice Harold Macmillan, 1st Earl of Stockton, {'1': ", '2': ", '3': ", '4': "} (10 February 1894 – 29 December 1986) was a British statesman of the Conservative Party who served as Prime Minister of the United Kingdom from 1957 to 1963. Nicknamed "Supermac", he was known for his pragmatism, wit and unflappability.
Document 14: Edward Carson: Edward Henry Carson, Baron Carson, PC, PC (Ire), KC (9 February 1854 – 22 October 1935), from 1900 to 1921 known as Sir Edward Carson, was an Irish unionist politician, barrister and judge. From Dublin, he became the leader of the Irish Unionist Alliance and Ulster Unionist Party between 1910 and 1921, held numerous positions in the Cabinet of the United Kingdom and served as a Lord of Appeal in Ordinary. He was one of the few people not a monarch to receive a British state funeral. Historian John Brown says that "His larger than life-size statue, erected in his own lifetime in front of the Northern Ireland parliament at Stormont, symbolizes the widely held perception that Northern Ireland is Carson's creation."
Document 15: David Faber (politician): David James Christian Faber (born 7 July 1961) was a Conservative member of the Parliament of the United Kingdom, then an author, before in 2010 being appointed as head master of Summer Fields School, Oxford. He is the grandson of the late former Conservative Prime Minister Harold Macmillan (1894–1986).
ground_truth: 1957 to 1963