
Prime Ministers since 2012 are: Gillard, Rudd, Abbott, Turnbull, Morrison and Albanese. About 10 years LNP; 4 years ALP.
I imagine that spending $20 billion to get petroleum reserves to scratch wouldn’t have been a high priority for governments. Oil companies wouldn’t do it unless forced to.
The current potential shortage is mostly due to an ill‑advised war started by Donald Trump.
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