Voter support for the Abbott government has plunged across all states over the past year and is significantly behind Labor in two-party-preferred terms everywhere except Western Australia, a Newspoll analysis shows.

• What Scott Morrison should do in his new portfolio
• Abbott’s cabinet reshuffle
• Morrison puts welfare sector on notice

The analysis published by News Corp Australia on Saturday shows that the Coalition’s primary vote has tumbled 10 points in Victoria and South Australia, nine points in NSW, eight points in Queensland and seven points in WA.

In two-party-preferred terms based on preference flows in the 2013 election, Labor leads the Coalition by 60 per cent to 40 per cent in Victoria, by 54 to 46 per cent in both NSW and South Australia and by 52 to 48 per cent in Queensland.

Only in WA does the Coalition have a two-party preferred lead – of 53 to 47 per cent.

Tony Abbott is considered the better prime minister in WA, with a nine-point lead of 43 to 34 per cent and in Queensland with 41 to 39 per cent.

But Opposition Leader Bill Shorten is ahead in NSW by 40 to 39 per cent, in Victoria by 45 to 33 per cent and in South Australia by 43 to 34 per cent.