(Adds Aer Lingus statement) DUBLIN, Feb 8 (Reuters) - Ireland’s sovereign wealth fund’s domestic investments in 2020 were almost exclusively in businesses impacted by the COVID-19 pandemic, including a 150 million euro ($180 million) loan to IAG’s Irish airline Aer Lingus. The Ireland Strategic Investment Fund (ISIF) was established in 2014 to invest in supporting economic activity and employment in Ireland. It was mandated last May to invest up to 2 billion euros directly in larger firms hit by the pandemic via equity, debt and hybrid instruments. It said on Monday that 90% of the 430 million euros invested in Ireland in 2020 was for this purpose, mostly so-called “stabilisation investments”, including the three-year Aer Lingus loan and 40 million euros committed to the Dublin Airport Authority.