The overall risk index for Israeli companies reached a record-best level in March, Business Data Israel (BDI) said Monday. The level of risk in the economy dropped to 5.0 from 5.9 in February. The new figure was the lowest in the five-year history of the index, which runs on a scale of one through 10. BDI also said the number of companies at risk of closing their doors declined to 14.1 percent in March, from 14.5% in February. By sector, the printing and publishing industry's risk factor was the most improved in the past year, with a 13.4% drop in the number of companies at risk. Plastic and rubber manufacturers saw their risk factors increase the most during the past 12 months, with a 10.1% rise, BDI said.