Boundary Adjustments
Electoral boundaries are adjusted after each election. The primary consideration is to attempt to ensure that the party that obtains 50% or more of the overall vote at a general election is able to form a government. The number of electors in each district must be within 10% of the average at the time of the redistribution order. After these primary considerations, other issues are considered, including economic, social and regional communities of interest. Despite this elaborate and expensive process, the system is not particularly reliable; cases where the party forming government has received less than 50% of the two-party-preferred vote are not un-common, and have occurred in two of the last three elections.
| Election | 1970 | 1973 | 1975 | 1977 | 1979 | 1982 | 1985 | 1989 | 1993 | 1997 | 2002 | 2006 | 2010 |
| Govt | ALP | ALP | ALP | ALP | Lib | ALP | ALP | ALP | Lib | Lib | ALP | ALP | ALP |
| # of seats | 27 | 26 | 24 | 27 | 27 | 25 | 29 | 24 | 37 | 26 | 24 | 32 | 26 |
| % of seats | 57.4 | 55.3 | 51.0 | 57.4 | 57.4 | 53.2 | 61.7 | 51.0 | 78.7 | 55.3 | 51.0 | 68.0 | 55.3 |
| % of vote | 53.3 | 54.5 | 49.2 | 53.4 | 55.0 | 50.9 | 53.2 | 48.1 | 61.0 | 51.5 | 49.1 | 56.8 | 48.4 |
Read more about this topic: Electoral Districts Of South Australia
Famous quotes containing the word boundary:
“No man has a right to fix the boundary of the march of a nation; no man has a right to say to his country, “Thus far shalt thou go and no further.””
—Charles Stewart Parnell (1846–1891)