Frequencies for first 10,000 rows of mod_year variable in person dataset : vehicle | model year | Freq. Percent Cum. ------------+----------------------------------- 1926 | 2 0.02 0.02 1930 | 1 0.01 0.03 1956 | 2 0.02 0.05 1957 | 2 0.02 0.07 1962 | 1 0.01 0.08 1964 | 4 0.04 0.12 1965 | 2 0.02 0.14 1966 | 3 0.03 0.17 1967 | 7 0.07 0.24 1968 | 1 0.01 0.25 1969 | 9 0.09 0.34 1970 | 4 0.04 0.38 1971 | 5 0.05 0.43 1972 | 1 0.01 0.44 1973 | 7 0.07 0.51 1974 | 1 0.01 0.52 1975 | 3 0.03 0.55 1976 | 1 0.01 0.56 1977 | 4 0.04 0.60 1978 | 9 0.09 0.69 1979 | 1 0.01 0.70 1980 | 3 0.03 0.73 1981 | 7 0.07 0.80 1982 | 11 0.11 0.91 1983 | 9 0.09 1.00 1984 | 15 0.15 1.15 1985 | 26 0.26 1.41 1986 | 23 0.23 1.64 1987 | 54 0.54 2.18 1988 | 40 0.40 2.58 1989 | 74 0.74 3.32 1990 | 86 0.86 4.18 1991 | 135 1.35 5.53 1992 | 139 1.39 6.92 1993 | 187 1.87 8.79 1994 | 205 2.05 10.84 1995 | 242 2.42 13.26 1996 | 251 2.51 15.77 1997 | 316 3.16 18.93 1998 | 389 3.89 22.82 1999 | 379 3.79 26.61 2000 | 565 5.65 32.26 2001 | 617 6.17 38.43 2002 | 547 5.47 43.90 2003 | 577 5.77 49.67 2004 | 672 6.72 56.39 2005 | 631 6.31 62.70 2006 | 489 4.89 67.59 2007 | 554 5.54 73.13 2008 | 375 3.75 76.88 2009 | 288 2.88 79.76 2010 | 269 2.69 82.45 2011 | 309 3.09 85.54 2012 | 322 3.22 88.76 2013 | 29 0.29 89.05 9999 | 220 2.20 91.25 . | 875 8.75 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016