Frequencies for first 10,000 rows of mod_year variable in person dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1932 | 2 0.02 0.02 1952 | 1 0.01 0.03 1955 | 1 0.01 0.04 1956 | 2 0.02 0.06 1963 | 1 0.01 0.07 1965 | 4 0.04 0.11 1966 | 5 0.05 0.16 1967 | 1 0.01 0.17 1968 | 6 0.06 0.23 1969 | 2 0.02 0.25 1970 | 1 0.01 0.26 1972 | 9 0.09 0.35 1973 | 5 0.05 0.40 1974 | 3 0.03 0.43 1975 | 5 0.05 0.48 1976 | 2 0.02 0.50 1977 | 7 0.07 0.57 1978 | 8 0.08 0.65 1979 | 8 0.08 0.73 1980 | 16 0.16 0.89 1981 | 10 0.10 0.99 1982 | 14 0.14 1.13 1983 | 15 0.15 1.28 1984 | 30 0.30 1.58 1985 | 40 0.40 1.98 1986 | 52 0.52 2.50 1987 | 45 0.45 2.95 1988 | 106 1.06 4.01 1989 | 84 0.84 4.85 1990 | 174 1.74 6.59 1991 | 144 1.44 8.03 1992 | 165 1.65 9.68 1993 | 228 2.28 11.96 1994 | 242 2.42 14.38 1995 | 399 3.99 18.37 1996 | 300 3.00 21.37 1997 | 361 3.61 24.98 1998 | 406 4.06 29.04 1999 | 498 4.98 34.02 2000 | 648 6.48 40.50 2001 | 637 6.37 46.87 2002 | 603 6.03 52.90 2003 | 644 6.44 59.34 2004 | 632 6.32 65.66 2005 | 604 6.04 71.70 2006 | 620 6.20 77.90 2007 | 547 5.47 83.37 2008 | 435 4.35 87.72 2009 | 232 2.32 90.04 2010 | 26 0.26 90.30 9999 | 215 2.15 92.45 . | 755 7.55 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016