Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1932 | 2 0.02 0.02 1946 | 1 0.01 0.03 1949 | 1 0.01 0.04 1953 | 1 0.01 0.05 1955 | 1 0.01 0.06 1959 | 2 0.02 0.08 1964 | 3 0.03 0.11 1965 | 6 0.06 0.17 1966 | 8 0.08 0.25 1967 | 3 0.03 0.28 1969 | 3 0.03 0.31 1970 | 6 0.06 0.37 1971 | 9 0.09 0.46 1972 | 10 0.10 0.56 1973 | 9 0.09 0.65 1974 | 10 0.10 0.75 1975 | 9 0.09 0.84 1976 | 9 0.09 0.93 1977 | 16 0.16 1.09 1978 | 28 0.28 1.37 1979 | 34 0.34 1.71 1980 | 17 0.17 1.88 1981 | 20 0.20 2.08 1982 | 39 0.39 2.47 1983 | 32 0.32 2.79 1984 | 58 0.58 3.37 1985 | 74 0.74 4.11 1986 | 108 1.08 5.19 1987 | 131 1.31 6.50 1988 | 180 1.80 8.30 1989 | 189 1.89 10.19 1990 | 244 2.44 12.63 1991 | 255 2.55 15.18 1992 | 254 2.54 17.72 1993 | 316 3.16 20.88 1994 | 376 3.76 24.64 1995 | 472 4.72 29.36 1996 | 417 4.17 33.53 1997 | 526 5.26 38.79 1998 | 502 5.02 43.81 1999 | 578 5.78 49.59 2000 | 671 6.71 56.30 2001 | 682 6.82 63.12 2002 | 591 5.91 69.03 2003 | 662 6.62 75.65 2004 | 663 6.63 82.28 2005 | 725 7.25 89.53 2006 | 664 6.64 96.17 2007 | 78 0.78 96.95 9999 | 305 3.05 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016