Frequencies for mod_year variable in vehnit dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1963 | 1 0.08 0.08 1969 | 2 0.16 0.24 1971 | 2 0.16 0.39 1972 | 1 0.08 0.47 1973 | 2 0.16 0.63 1974 | 1 0.08 0.71 1975 | 2 0.16 0.86 1976 | 1 0.08 0.94 1977 | 1 0.08 1.02 1978 | 4 0.31 1.34 1980 | 3 0.24 1.57 1981 | 2 0.16 1.73 1982 | 4 0.31 2.04 1983 | 4 0.31 2.36 1984 | 7 0.55 2.91 1985 | 9 0.71 3.62 1986 | 7 0.55 4.17 1987 | 15 1.18 5.35 1988 | 23 1.81 7.15 1989 | 19 1.49 8.65 1990 | 22 1.73 10.38 1991 | 29 2.28 12.66 1992 | 35 2.75 15.41 1993 | 27 2.12 17.53 1994 | 46 3.62 21.15 1995 | 57 4.48 25.63 1996 | 51 4.01 29.64 1997 | 68 5.35 34.98 1998 | 57 4.48 39.47 1999 | 76 5.97 45.44 2000 | 90 7.08 52.52 2001 | 80 6.29 58.81 2002 | 66 5.19 63.99 2003 | 63 4.95 68.95 2004 | 73 5.74 74.69 2005 | 91 7.15 81.84 2006 | 77 6.05 87.89 2007 | 84 6.60 94.50 2008 | 42 3.30 97.80 2009 | 4 0.31 98.11 9999 | 24 1.89 100.00 ------------+----------------------------------- Total | 1,272 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016