Frequencies for mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1961 | 1 0.09 0.09 1965 | 1 0.09 0.19 1968 | 1 0.09 0.28 1970 | 1 0.09 0.37 1974 | 1 0.09 0.46 1976 | 1 0.09 0.56 1977 | 4 0.37 0.93 1978 | 3 0.28 1.21 1979 | 5 0.46 1.67 1980 | 15 1.39 3.06 1981 | 14 1.30 4.36 1982 | 7 0.65 5.01 1983 | 6 0.56 5.57 1984 | 11 1.02 6.59 1985 | 29 2.69 9.29 1986 | 29 2.69 11.98 1987 | 32 2.97 14.95 1988 | 20 1.86 16.81 1989 | 29 2.69 19.50 1990 | 30 2.79 22.28 1991 | 21 1.95 24.23 1992 | 21 1.95 26.18 1993 | 44 4.09 30.27 1994 | 39 3.62 33.89 1995 | 47 4.36 38.25 1996 | 25 2.32 40.58 1997 | 51 4.74 45.31 1998 | 42 3.90 49.21 1999 | 45 4.18 53.39 2000 | 53 4.92 58.31 2001 | 27 2.51 60.82 2002 | 54 5.01 65.83 2003 | 59 5.48 71.31 2004 | 48 4.46 75.77 9999 | 68 6.31 82.08 . | 193 17.92 100.00 ------------+----------------------------------- Total | 1,077 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016