Frequencies for first 10,000 rows of mod_year variable in person dataset : Vehicle | Model Year | Freq. Percent Cum. ------------+----------------------------------- 1932 | 2 0.02 0.02 1947 | 1 0.01 0.03 1954 | 1 0.01 0.04 1955 | 1 0.01 0.05 1956 | 2 0.02 0.07 1963 | 3 0.03 0.10 1965 | 4 0.04 0.14 1966 | 3 0.03 0.17 1967 | 2 0.02 0.19 1968 | 3 0.03 0.22 1969 | 7 0.07 0.29 1970 | 5 0.05 0.34 1971 | 2 0.02 0.36 1972 | 2 0.02 0.38 1973 | 8 0.08 0.46 1974 | 6 0.06 0.52 1975 | 8 0.08 0.60 1976 | 6 0.06 0.66 1977 | 5 0.05 0.71 1978 | 5 0.05 0.76 1979 | 22 0.22 0.98 1980 | 10 0.10 1.08 1981 | 8 0.08 1.16 1982 | 15 0.15 1.31 1983 | 14 0.14 1.45 1984 | 18 0.18 1.63 1985 | 24 0.24 1.87 1986 | 20 0.20 2.07 1987 | 33 0.33 2.40 1988 | 63 0.63 3.03 1989 | 91 0.91 3.94 1990 | 128 1.28 5.22 1991 | 114 1.14 6.36 1992 | 193 1.93 8.29 1993 | 160 1.60 9.89 1994 | 276 2.76 12.65 1995 | 271 2.71 15.36 1996 | 320 3.20 18.56 1997 | 445 4.45 23.01 1998 | 405 4.05 27.06 1999 | 513 5.13 32.19 2000 | 619 6.19 38.38 2001 | 477 4.77 43.15 2002 | 576 5.76 48.91 2003 | 676 6.76 55.67 2004 | 613 6.13 61.80 2005 | 579 5.79 67.59 2006 | 629 6.29 73.88 2007 | 565 5.65 79.53 2008 | 408 4.08 83.61 2009 | 280 2.80 86.41 2010 | 196 1.96 88.37 2011 | 25 0.25 88.62 9999 | 268 2.68 91.30 . | 870 8.70 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016