BEIJING: China’s National Social Security Fund (NSSF) recorded a 15.14 per cent return on its investments last year, business magazine Caijing reported on Sunday, citing a speech from the organisation’s vice chairman. The performance marks an improvement on 2014, when the fund secured an 11.43 per cent return on investment. The NSSF had 1.8 trillion yuan in assets at the end of 2015, the magazine quoted Wang Zhongmin as telling a conference in Beijing on Saturday. China is trying to strengthen its pension system to cope with the huge challenge of an already-shrinking working-age population. The ruling Communist Party announced in October last year that it would ease family planning restrictions to allow all couples to have two children after decades of a strict one-child policy, a move aimed at alleviating demographic strains on economy.