Trends in the prevalence of alcohol use among high school seniors:
MTF, 1975-97.

-------------------------------------------------------------------------
                              Percent Using Alcohol
Graduating  -------------------------------------------------------------
Year                                                        5+ in a row
            Lifetime      Annual      30-Day      Daily      past 2 wks
-------------------------------------------------------------------------

1997          81.7         74.8        52.7        3.9         31.3
1996          79.2         72.5        50.8        3.7         30.2
1995          80.7         73.7        51.3        3.5         29.8

1994          80.4         73.0        50.1        2.9         28.2
1993[1]       87.0         76.0        51.0        2.5         27.5
1992          87.5         76.8        51.3        3.4         27.9
1991          88.0         77.7        54.0        3.6         29.8
1990          89.5         80.6        57.1        3.7         32.2

1989          90.7         82.7        60.0        4.2         33.0
1988          92.0         85.3        63.9        4.2         34.7
1987          92.2         85.7        66.4        4.8         37.5
1986          91.3         84.5        65.3        4.8         36.8
1985          92.2         85.6        65.9        5.0         36.7

1984          92.6         86.0        67.2        4.8         38.7
1983          92.6         87.3        69.4        5.5         40.8
1982          92.8         86.8        69.7        5.7         40.5
1981          92.6         87.0        70.7        6.0         41.4
1980          93.2         87.9        72.0        6.0         41.2

1979          93.0         88.1        71.8        6.9         41.2
1978          93.1         87.7        72.1        5.7         40.3
1977          92.5         87.0        71.2        6.1         39.4
1976          91.9         85.7        68.3        5.6         37.4
1975          90.4         84.8        68.2        5.7         36.8
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Source: National Institute on Drug Abuse.  Johnson, L.D., O'Malley, P.M.,
        and Bachman, J.G., University of Michigan, Institute for Social
        Research, NATIONAL SURVEY RESULTS ON DRUG USE FROM THE MONITORING
        THE FUTURE STUDY, 1975-1997. Volume I, Secondary School Students.
        Rockville, MD: NIH, Publication No. 98-4345.

[1] Split forms, 3 with slight wording change indicating "drink" meant 
    "more than a few sips," and 3 with the original wording.  See source
     above for sampling, design, and statistical issues over the years.