Table:
text: List of Premiers of Tasmania by time in office
Rank by time in office
Rank by time in office
Rank_ Premier_ Party_ Assumed_Office_ Left_Office_ TOTAL_Time_in_Office_
15. Ray Groom Liberal 17 February 1992 18 March 1996 4years, 30days
16. Doug Lowe Labor 1 December 1977 11 November 1981 3years, 345days
17. James Whyte No Party Alignment 20 January 1863 24 November 1866 3years, 308days
18. Francis Smith No Party Alignment 12 May 1857 1 November 1860 3years, 173days
19. James Wilson No Party Alignment 4 August 1869 4 November 1872 3years, 92days
20. Alfred Kennerley No Party Alignment 4 August 1873 20 July 1876 2years, 351days
21. Angus Bethune Liberal 26 May 1969 3 May 1972 2years, 343days
22. Lara Giddings Labor 23 January 2011 Incumbent 3years, 9days

Question: What was his rank on the list of Prime Ministers of Tasmania by term when he took office on 12 May 1857?