Among the facts they’ve emphasized is a 65 per cent increase in the number of Ontarians on ODSP between 2003 and 2014, reaching a total of roughly 325,000. Only a small portion of that growth is due to population aging and the breakdown of physical health, according to the data. The largest factor — about 64 per cent of the total growth of ODSP claims over that time frame — is mental health disabilities such as depression and anxiety