In common with many other developed countries, Canada is experiencing a cost increase due to a demographic shift towards an older population, with more retirees and fewer people of working age. In 2006, the average age was 39.5 years; within twelve years it had risen to 42.4 years, with a life expectancy of 81.1 years. A 2016 report by the chief public health officer found that 88 percent of Canadians, one of the highest proportions of the population among G7 countries, indicated that they "had good or very good health". 80 percent of Canadian adults self-report having at least one major risk factor for chronic disease: smoking, physical inactivity, unhealthy eating or excessive alcohol use. Canada has one of the highest rates of adult obesity among Organisation for Economic Co-operation and Development (OECD) countries attributing to approximately 2.7 million cases of diabetes (types 1 and 2 combined). Four chronic diseases—cancer (leading cause of death), cardiovascular diseases, respiratory diseases and diabetes—account for 65 percent of deaths in Canada.