Rusal, the world’s largest aluminium producer by volume, said on Monday that adjusted net profit results for 2011 showed a plunge of 91.7 percent due to high debt servicing outgoings and lower aluminium prices.

The group posted a net profit of $237m compared to $2.87bn the year before largely because of a write-down in the value of its share in miner Norilsk Nickel. Figures were well below expectations, with Thomson Reuters’ analysts predicting $2.04bn.

Revenues for 2011 increased 12 percent to $12.29bn from $10.98 year on year. The company also announced it has replaced executive director Tatiana Soina with Maxim Sokov. The news comes just days after the company replaced chairman Victor Vekselberg with Barry Cheung.