Labour force participation differed within age and gender groupings and was similar to that in other industrialized nations in its relative distribution among primary, secondary, and tertiary industries. The percentage of people employed in the primary sector (agriculture, forestry, and fishing) dropped from 17.4 in 1970 to 7.2 in 1990 and was projected to fall to 4.9 by 2000. The percentage of the Japanese labor force employed in heavy industry was 33.7 in 1970; it dropped to 33.1 in 1987 and was expected to be 27.7 in 2000.