Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1949 | 2 0.02 0.02 1953 | 1 0.01 0.03 1955 | 1 0.01 0.04 1957 | 3 0.03 0.07 1959 | 1 0.01 0.08 1961 | 1 0.01 0.09 1963 | 1 0.01 0.10 1964 | 2 0.02 0.12 1965 | 3 0.03 0.15 1966 | 5 0.05 0.20 1967 | 6 0.06 0.26 1968 | 2 0.02 0.28 1969 | 9 0.09 0.37 1970 | 19 0.19 0.56 1971 | 15 0.15 0.71 1972 | 24 0.24 0.95 1973 | 28 0.28 1.23 1974 | 31 0.31 1.54 1975 | 9 0.09 1.63 1976 | 23 0.23 1.86 1977 | 29 0.29 2.15 1978 | 51 0.51 2.66 1979 | 88 0.88 3.54 1980 | 40 0.40 3.94 1981 | 65 0.65 4.59 1982 | 51 0.51 5.10 1983 | 69 0.69 5.79 1984 | 179 1.79 7.58 1985 | 208 2.08 9.66 1986 | 232 2.32 11.98 1987 | 252 2.52 14.50 1988 | 385 3.85 18.35 1989 | 430 4.30 22.65 1990 | 455 4.55 27.20 1991 | 359 3.59 30.79 1992 | 398 3.98 34.77 1993 | 515 5.15 39.92 1994 | 561 5.61 45.53 1995 | 669 6.69 52.22 1996 | 585 5.85 58.07 1997 | 676 6.76 64.83 1998 | 600 6.00 70.83 1999 | 599 5.99 76.82 2000 | 834 8.34 85.16 2001 | 603 6.03 91.19 2002 | 38 0.38 91.57 9999 | 176 1.76 93.33 . | 667 6.67 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016