Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1932 | 2 0.02 0.02 1949 | 1 0.01 0.03 1953 | 1 0.01 0.04 1964 | 3 0.03 0.07 1965 | 5 0.05 0.12 1966 | 5 0.05 0.17 1967 | 3 0.03 0.20 1969 | 2 0.02 0.22 1971 | 6 0.06 0.28 1972 | 8 0.08 0.36 1973 | 4 0.04 0.40 1974 | 7 0.07 0.47 1975 | 4 0.04 0.51 1976 | 5 0.05 0.56 1977 | 8 0.08 0.64 1978 | 27 0.27 0.91 1979 | 30 0.30 1.21 1980 | 13 0.13 1.34 1981 | 16 0.16 1.50 1982 | 41 0.41 1.91 1983 | 31 0.31 2.22 1984 | 57 0.57 2.79 1985 | 70 0.70 3.49 1986 | 100 1.00 4.49 1987 | 116 1.16 5.65 1988 | 139 1.39 7.04 1989 | 129 1.29 8.33 1990 | 203 2.03 10.36 1991 | 237 2.37 12.73 1992 | 223 2.23 14.96 1993 | 290 2.90 17.86 1994 | 390 3.90 21.76 1995 | 491 4.91 26.67 1996 | 411 4.11 30.78 1997 | 547 5.47 36.25 1998 | 501 5.01 41.26 1999 | 584 5.84 47.10 2000 | 691 6.91 54.01 2001 | 664 6.64 60.65 2002 | 565 5.65 66.30 2003 | 590 5.90 72.20 2004 | 625 6.25 78.45 2005 | 674 6.74 85.19 2006 | 586 5.86 91.05 2007 | 36 0.36 91.41 9999 | 237 2.37 93.78 . | 622 6.22 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016