Frequencies for mod_year variable in vehnit dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1964 | 1 0.09 0.09 1968 | 1 0.09 0.18 1969 | 1 0.09 0.27 1971 | 2 0.18 0.45 1972 | 1 0.09 0.54 1973 | 1 0.09 0.63 1974 | 1 0.09 0.72 1975 | 1 0.09 0.81 1977 | 3 0.27 1.08 1978 | 1 0.09 1.16 1980 | 1 0.09 1.25 1981 | 3 0.27 1.52 1983 | 6 0.54 2.06 1984 | 5 0.45 2.51 1985 | 9 0.81 3.32 1986 | 7 0.63 3.94 1987 | 11 0.99 4.93 1988 | 12 1.08 6.00 1989 | 20 1.79 7.80 1990 | 15 1.34 9.14 1991 | 12 1.08 10.22 1992 | 24 2.15 12.37 1993 | 28 2.51 14.87 1994 | 35 3.14 18.01 1995 | 36 3.23 21.24 1996 | 36 3.23 24.46 1997 | 58 5.20 29.66 1998 | 52 4.66 34.32 1999 | 85 7.62 41.94 2000 | 70 6.27 48.21 2001 | 62 5.56 53.76 2002 | 62 5.56 59.32 2003 | 55 4.93 64.25 2004 | 73 6.54 70.79 2005 | 63 5.65 76.43 2006 | 79 7.08 83.51 2007 | 73 6.54 90.05 2008 | 49 4.39 94.44 2009 | 41 3.67 98.12 2010 | 2 0.18 98.30 9999 | 19 1.70 100.00 ------------+----------------------------------- Total | 1,116 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016