The above graph shows the two party preferred vote at each election since 1949. Election years are indicated inside the graph under the lines ('49, '51 etc). Two party preferred votes are after full distribution of preferences, and by definition add up to 100% at any instance. Learn more here. Purple asterisks show the five times government changed at elections (1949, 1972, 1975, 1983 and 1996); the green the five times the party that won most votes didn't win the election (1954, 1961, 1969, 1990 and 1998). Each of the latter were in opposition before (and of course after) the election; probably this shows the benefits of incumbency.

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