Malcolm Turnbull will mark his first anniversary as prime minister with a worse approval rating than Bill Shorten, according to the latest Newspoll published in the Australian.

Despite last week’s resignation of the prominent Labor senator Sam Dastyari from the shadow frontbench, there has also been no gain for the Coalition over the opposition.

The poll of 1,680 voters, surveyed from last Thursday to Sunday, shows no change in the past fortnight in the primary vote for the major parties, with the Coalition remaining on 41%, Labor on 36%, the Greens at 9% and minor parties and independents at a combined 14%.

Based on preference flows from the July election, the two-party-preferred vote is unchanged at 50-50.

The dissatisfaction with Turnbull’s performance grew one point to a new high of 53% and has more than doubled over his 12 months as leader.

His net satisfaction rating – the difference between those who are satisfied and those who are dissatisfied – has reached a low of minus 19 points, a huge drop from his honeymoon peak of 38 points.

He continues to trail Shorten, who sits on a net satisfaction rating of minus 17 points.

