Zimbabwe’s veteran president Robert Mugabe was booed and heckled by opposition politicians over the deteriorating economy as he gave his state of the nation address to parliament on Tuesday.

Movement for Democratic Change parliamentarians questioned his economic policies, jeering as the 91-year-old delivered a policy speech which lasted less than half an hour.

He spoke as the UN confirmed earlier estimates that around 1.5 million Zimbabweans or 16% of the country’s population will face hunger later this year and need food aid.

When Mugabe – who has been in power since Zimbabwe’s independence from Britain in 1980 – outlined his government’s plan to improve the economy, one lawmaker yelled at him to admit “you can’t do much about it”.

Mugabe presented a 10-point plan which included boosting agricultural growth, encouraging private sector investment and fighting graft.

“What about job creation?” one opposition member shouted while another accused Mugabe’s government of “corruption”.

Others shouted “if wishes were horses” and “you have utterly failed”.

The economy of the southern African nation has been on a downward spiral for more than a decade with slow growth, low liquidity and high unemployment.

Many companies have closed, downsized or relocated to neighbouring countries.

The government has cut its growth forecasts for 2015 to 1.5% from 3.2%, mainly due to slow growth in the agricultural sector.

Zimbabwe’s harvest of the staple corn has shrunk by half due to erratic rains and abnormally high temperatures.

The country will need to import 700,000 tonnes of corn to feed those facing hunger in the coming months.