SAN DIEGO (KGTV) - San Diego’s unemployment rate fell to 2.9 percent in April, the lowest rate yet in this century. 1,577,000 people were part of the San Diego labor force last month, according to the California Employment Development Department. Only 46,200 people did not have jobs. California’s unemployment rate was at 4.2 percent in April, the lowest level since 1976. San Francisco and Marin Counties had the lowest unemployment rate of 2.1 percent. The highest unemployment rates were in Colusa County, at 15 percent, and Imperial County, at 14.4 percent.