Over the longer period, 1973–90, the composition of Portugal's GDP at factor cost changed significantly. The contribution of agriculture, forestry, and fishing as a share of total production continued its inexorable decline, to 6.1 percent from 12.2 percent in 1973. In contrast to the pre-revolutionary period, 1961–73, when the industrial sector grew by 9 percent annually and its contribution to GDP expanded, industry's share narrowed from 44 to 38.4 percent of GDP. Manufacturing, the major component of the industrial sector, contributed relatively less to GDP in 1990, falling from 35 to 28 percent. Most striking was the 16 percentage point increase in the participation of the services sector from 39 percent to 55.5 percent. Most of this growth reflected the proliferation of civil service employment and the associated cost of public administration, together with the dynamic contribution of tourism services during the 1980s.