Tenure of post WWII Australian PMs

Fascinating to look at the length of tenure of Australian PM since WWII:

1. Robert Menzies 16 years (retired)
2. Harold Holt 2 years (died)
3. John Gorton 3 years (rolled)
4. Billy McMahon 2 years (defeated)
5. Gough Whitlam 3 years (defeated/sacked)
6. Malcolm Fraser 8 years (defeated)
7. Bob Hawke 9 years (rolled)
8. Paul Keating 4 years (defeated)
9. John Howard 12 years (defeated)
10. Kevin Rudd 2.5 years (rolled)
11. Julia Gillard 3 years (rolled)
12. Kevin Rudd 0.25 years (defeated)
13. Tony Abbott 2 years (rolled)

So you had the Menzies era, then a series of short-term PMs. Then from Fraser to Howard you have huge stability, and since Howard no Prime Minister elected at one election has survived until the next!