While the economy lost 7.5 million positions during the 18-month recession, the health-care industry added doctors, nurses, and other hospital personnel. Together with the social assistance category, which includes day-care workers, career counselors, and similar positions, the sector will add more than 5.6 million employees and be the biggest job gainer by 2020, according to new projections by the Bureau of Labor Statistics. Registered nursing, which requires at least an associate degree, will have the largest growth of all US occupations, according to the Bureau of Labor Statistics, adding 711,900 jobs between 2010 and 2020, reaching a total of 3.4 million. The number of home health aides, who don't need a high school diploma but require on-the-job training, will increase by 69%, to 1.7 million.