Year	Hours Per Week
1970	37.8
1971	37.8
1972	37.7
1973	37.9
1974	36.8
1975	36.6
1976	35.7
1977	36.9
1978	37.1
1979	37.2
1980	36.7
1981	35.5
1982	36.2
1983	36.3
1984	36.1
1985	35.9
1986	36.4
1987	35.1
1988	35.9
1989	36.5
1990	35.5
1991	35.8
1992	35
1993	35.7