Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1935 | 1 0.01 0.01 1947 | 2 0.02 0.03 1960 | 1 0.01 0.04 1962 | 1 0.01 0.05 1963 | 2 0.02 0.07 1964 | 7 0.07 0.14 1965 | 1 0.01 0.15 1966 | 6 0.06 0.21 1967 | 8 0.08 0.29 1968 | 5 0.05 0.34 1969 | 6 0.06 0.40 1970 | 7 0.07 0.47 1971 | 3 0.03 0.50 1972 | 10 0.10 0.60 1973 | 4 0.04 0.64 1974 | 3 0.03 0.67 1975 | 7 0.07 0.74 1976 | 11 0.11 0.85 1977 | 18 0.18 1.03 1978 | 9 0.09 1.12 1979 | 28 0.28 1.40 1980 | 20 0.20 1.60 1981 | 38 0.38 1.98 1982 | 19 0.19 2.17 1983 | 34 0.34 2.51 1984 | 70 0.70 3.21 1985 | 80 0.80 4.01 1986 | 85 0.85 4.86 1987 | 132 1.32 6.18 1988 | 190 1.90 8.08 1989 | 230 2.30 10.38 1990 | 204 2.04 12.42 1991 | 267 2.67 15.09 1992 | 307 3.07 18.16 1993 | 409 4.09 22.25 1994 | 414 4.14 26.39 1995 | 525 5.25 31.64 1996 | 500 5.00 36.64 1997 | 552 5.52 42.16 1998 | 567 5.67 47.83 1999 | 595 5.95 53.78 2000 | 661 6.61 60.39 2001 | 637 6.37 66.76 2002 | 587 5.87 72.63 2003 | 614 6.14 78.77 2004 | 638 6.38 85.15 2005 | 594 5.94 91.09 2006 | 17 0.17 91.26 9999 | 246 2.46 93.72 . | 628 6.28 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016