Frequencies for first 10,000 rows of mod_year variable in person dataset : Vehicle | Model Year | Freq. Percent Cum. ------------+----------------------------------- 1930 | 2 0.02 0.02 1931 | 1 0.01 0.03 1950 | 1 0.01 0.04 1951 | 1 0.01 0.05 1960 | 1 0.01 0.06 1963 | 1 0.01 0.07 1965 | 7 0.07 0.14 1967 | 1 0.01 0.15 1969 | 4 0.04 0.19 1970 | 6 0.06 0.25 1971 | 5 0.05 0.30 1972 | 3 0.03 0.33 1973 | 5 0.05 0.38 1974 | 7 0.07 0.45 1975 | 5 0.05 0.50 1976 | 2 0.02 0.52 1977 | 5 0.05 0.57 1978 | 4 0.04 0.61 1979 | 12 0.12 0.73 1980 | 4 0.04 0.77 1981 | 4 0.04 0.81 1982 | 8 0.08 0.89 1983 | 16 0.16 1.05 1984 | 19 0.19 1.24 1985 | 32 0.32 1.56 1986 | 37 0.37 1.93 1987 | 29 0.29 2.22 1988 | 70 0.70 2.92 1989 | 51 0.51 3.43 1990 | 118 1.18 4.61 1991 | 140 1.40 6.01 1992 | 123 1.23 7.24 1993 | 189 1.89 9.13 1994 | 226 2.26 11.39 1995 | 329 3.29 14.68 1996 | 276 2.76 17.44 1997 | 350 3.50 20.94 1998 | 443 4.43 25.37 1999 | 509 5.09 30.46 2000 | 458 4.58 35.04 2001 | 567 5.67 40.71 2002 | 616 6.16 46.87 2003 | 612 6.12 52.99 2004 | 567 5.67 58.66 2005 | 614 6.14 64.80 2006 | 591 5.91 70.71 2007 | 590 5.90 76.61 2008 | 412 4.12 80.73 2009 | 277 2.77 83.50 2010 | 234 2.34 85.84 2011 | 244 2.44 88.28 2012 | 35 0.35 88.63 9998 | 1 0.01 88.64 9999 | 239 2.39 91.03 . | 897 8.97 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016