Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1929 | 2 0.02 0.02 1932 | 3 0.03 0.05 1941 | 1 0.01 0.06 1948 | 1 0.01 0.07 1949 | 1 0.01 0.08 1958 | 5 0.05 0.13 1960 | 1 0.01 0.14 1961 | 2 0.02 0.16 1962 | 1 0.01 0.17 1963 | 3 0.03 0.20 1964 | 3 0.03 0.23 1965 | 9 0.09 0.32 1966 | 18 0.18 0.50 1967 | 12 0.12 0.62 1968 | 18 0.18 0.80 1969 | 17 0.17 0.97 1970 | 21 0.21 1.18 1971 | 21 0.21 1.39 1972 | 25 0.25 1.64 1973 | 24 0.24 1.88 1974 | 28 0.28 2.16 1975 | 33 0.33 2.49 1976 | 55 0.55 3.04 1977 | 47 0.47 3.51 1978 | 76 0.76 4.27 1979 | 138 1.38 5.65 1980 | 39 0.39 6.04 1981 | 90 0.90 6.94 1982 | 88 0.88 7.82 1983 | 124 1.24 9.06 1984 | 169 1.69 10.75 1985 | 261 2.61 13.36 1986 | 310 3.10 16.46 1987 | 322 3.22 19.68 1988 | 360 3.60 23.28 1989 | 511 5.11 28.39 1990 | 408 4.08 32.47 1991 | 537 5.37 37.84 1992 | 506 5.06 42.90 1993 | 490 4.90 47.80 1994 | 670 6.70 54.50 1995 | 667 6.67 61.17 1996 | 517 5.17 66.34 1997 | 611 6.11 72.45 1998 | 567 5.67 78.12 1999 | 686 6.86 84.98 2000 | 621 6.21 91.19 2001 | 44 0.44 91.63 9999 | 155 1.55 93.18 . | 682 6.82 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016