Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1929 | 1 0.01 0.01 1932 | 2 0.02 0.03 1951 | 1 0.01 0.04 1956 | 3 0.03 0.07 1958 | 1 0.01 0.08 1960 | 1 0.01 0.09 1961 | 1 0.01 0.10 1964 | 2 0.02 0.12 1966 | 2 0.02 0.14 1967 | 2 0.02 0.16 1968 | 4 0.04 0.20 1969 | 2 0.02 0.22 1970 | 6 0.06 0.28 1971 | 2 0.02 0.30 1972 | 4 0.04 0.34 1973 | 9 0.09 0.43 1974 | 8 0.08 0.51 1975 | 7 0.07 0.58 1976 | 2 0.02 0.60 1977 | 7 0.07 0.67 1978 | 8 0.08 0.75 1979 | 15 0.15 0.90 1980 | 8 0.08 0.98 1981 | 33 0.33 1.31 1982 | 20 0.20 1.51 1983 | 16 0.16 1.67 1984 | 44 0.44 2.11 1985 | 48 0.48 2.59 1986 | 61 0.61 3.20 1987 | 71 0.71 3.91 1988 | 112 1.12 5.03 1989 | 171 1.71 6.74 1990 | 155 1.55 8.29 1991 | 205 2.05 10.34 1992 | 218 2.18 12.52 1993 | 292 2.92 15.44 1994 | 335 3.35 18.79 1995 | 393 3.93 22.72 1996 | 389 3.89 26.61 1997 | 484 4.84 31.45 1998 | 485 4.85 36.30 1999 | 638 6.38 42.68 2000 | 667 6.67 49.35 2001 | 622 6.22 55.57 2002 | 604 6.04 61.61 2003 | 716 7.16 68.77 2004 | 576 5.76 74.53 2005 | 652 6.52 81.05 2006 | 670 6.70 87.75 2007 | 426 4.26 92.01 2008 | 17 0.17 92.18 9999 | 167 1.67 93.85 . | 615 6.15 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016