Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1953 | 1 0.01 0.01 1964 | 8 0.08 0.09 1965 | 2 0.02 0.11 1966 | 1 0.01 0.12 1967 | 3 0.03 0.15 1968 | 4 0.04 0.19 1969 | 3 0.03 0.22 1970 | 8 0.08 0.30 1971 | 5 0.05 0.35 1972 | 7 0.07 0.42 1973 | 9 0.09 0.51 1974 | 20 0.20 0.71 1975 | 15 0.15 0.86 1976 | 23 0.23 1.09 1977 | 23 0.23 1.32 1978 | 31 0.31 1.63 1979 | 28 0.28 1.91 1980 | 16 0.16 2.07 1981 | 25 0.25 2.32 1982 | 61 0.61 2.93 1983 | 30 0.30 3.23 1984 | 65 0.65 3.88 1985 | 106 1.06 4.94 1986 | 133 1.33 6.27 1987 | 200 2.00 8.27 1988 | 233 2.33 10.60 1989 | 272 2.72 13.32 1990 | 284 2.84 16.16 1991 | 394 3.94 20.10 1992 | 310 3.10 23.20 1993 | 410 4.10 27.30 1994 | 443 4.43 31.73 1995 | 569 5.69 37.42 1996 | 495 4.95 42.37 1997 | 598 5.98 48.35 1998 | 542 5.42 53.77 1999 | 675 6.75 60.52 2000 | 657 6.57 67.09 2001 | 637 6.37 73.46 2002 | 610 6.10 79.56 2003 | 708 7.08 86.64 2004 | 512 5.12 91.76 2005 | 26 0.26 92.02 9999 | 229 2.29 94.31 . | 569 5.69 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016