Past performance can tell you some important things about a fund, for example the effect of the manager's particular way of investing. Click here for the percentage returns of the average UK All Companies fund over 10 years, measured June to June. Despite the losses in 2001, 2002, and 2003, the fund shows a pattern of growth over a 10 year period. This indicates that a long term investment in this fund is more likely to generate returns than losses.