1902-1906
B
C

1906-1908
CB
L

1908-1916
A
L

1916-1922
LG
L (coalition)

1922-1923 (8mnths)
BL
C

1923
B
C

1924
M
L

1924 - 1929
B
C

1929-1931
M
L

1931-1935
M
National Government

1935-1937
B
National Gov. (Cons)

1937-1940
C
National Gov. (Cons)

1940-1945
WC
C (C)

1945-1951
A
L