Frequencies for mod_year variable in vehnit dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1964 | 1 0.07 0.07 1967 | 2 0.14 0.20 1969 | 1 0.07 0.27 1970 | 2 0.14 0.41 1972 | 1 0.07 0.47 1973 | 1 0.07 0.54 1974 | 2 0.14 0.68 1975 | 2 0.14 0.81 1976 | 4 0.27 1.08 1977 | 4 0.27 1.35 1978 | 1 0.07 1.42 1979 | 10 0.68 2.09 1980 | 4 0.27 2.36 1981 | 10 0.68 3.04 1982 | 4 0.27 3.31 1983 | 11 0.74 4.05 1984 | 13 0.88 4.93 1985 | 18 1.22 6.14 1986 | 36 2.43 8.58 1987 | 22 1.49 10.06 1988 | 40 2.70 12.76 1989 | 42 2.84 15.60 1990 | 46 3.11 18.70 1991 | 60 4.05 22.75 1992 | 64 4.32 27.08 1993 | 57 3.85 30.93 1994 | 61 4.12 35.04 1995 | 84 5.67 40.72 1996 | 66 4.46 45.17 1997 | 78 5.27 50.44 1998 | 87 5.87 56.31 1999 | 88 5.94 62.26 2000 | 111 7.49 69.75 2001 | 75 5.06 74.81 2002 | 74 5.00 79.81 2003 | 84 5.67 85.48 2004 | 90 6.08 91.56 2005 | 73 4.93 96.49 2006 | 9 0.61 97.10 9999 | 43 2.90 100.00 ------------+----------------------------------- Total | 1,481 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016