Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1953 | 2 0.02 0.02 1954 | 2 0.02 0.04 1956 | 4 0.04 0.08 1960 | 1 0.01 0.09 1961 | 1 0.01 0.10 1962 | 2 0.02 0.12 1963 | 2 0.02 0.14 1964 | 1 0.01 0.15 1965 | 4 0.04 0.19 1966 | 8 0.08 0.27 1967 | 4 0.04 0.31 1968 | 5 0.05 0.36 1969 | 11 0.11 0.47 1970 | 11 0.11 0.58 1971 | 11 0.11 0.69 1972 | 8 0.08 0.77 1973 | 28 0.28 1.05 1974 | 11 0.11 1.16 1975 | 19 0.19 1.35 1976 | 18 0.18 1.53 1977 | 31 0.31 1.84 1978 | 40 0.40 2.24 1979 | 35 0.35 2.59 1980 | 32 0.32 2.91 1981 | 42 0.42 3.33 1982 | 67 0.67 4.00 1983 | 72 0.72 4.72 1984 | 109 1.09 5.81 1985 | 196 1.96 7.77 1986 | 191 1.91 9.68 1987 | 244 2.44 12.12 1988 | 295 2.95 15.07 1989 | 322 3.22 18.29 1990 | 339 3.39 21.68 1991 | 386 3.86 25.54 1992 | 405 4.05 29.59 1993 | 528 5.28 34.87 1994 | 487 4.87 39.74 1995 | 653 6.53 46.27 1996 | 581 5.81 52.08 1997 | 604 6.04 58.12 1998 | 551 5.51 63.63 1999 | 707 7.07 70.70 2000 | 700 7.00 77.70 2001 | 752 7.52 85.22 2002 | 558 5.58 90.80 2003 | 39 0.39 91.19 9999 | 232 2.32 93.51 . | 649 6.49 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016