April 1 (UPI) -- Private sector hiring in the United States remained steady in March, bolstered by small businesses, the ADP National Employment Report said Wednesday. Small businesses with less than 20 employees added 112,000 jobs in March. Mid-sized businesses with 250 to 499 employees added 6,000 jobs. All other categories reduced payrolls with small businesses of 20 to 49 employees losing 27,000 jobs and businesses of 50 to 249 employees losing 26,000 jobs. "Overall hiring is steady, but