Frequencies for first 10,000 rows of mod_year variable in person dataset : vehicle | model year | Freq. Percent Cum. ------------+----------------------------------- 1931 | 2 0.02 0.02 1932 | 1 0.01 0.03 1948 | 2 0.02 0.05 1963 | 2 0.02 0.07 1965 | 3 0.03 0.10 1966 | 3 0.03 0.13 1967 | 1 0.01 0.14 1968 | 2 0.02 0.16 1969 | 1 0.01 0.17 1970 | 1 0.01 0.18 1971 | 5 0.05 0.23 1972 | 3 0.03 0.26 1973 | 6 0.06 0.32 1974 | 3 0.03 0.35 1975 | 1 0.01 0.36 1976 | 7 0.07 0.43 1977 | 1 0.01 0.44 1978 | 1 0.01 0.45 1979 | 3 0.03 0.48 1980 | 3 0.03 0.51 1981 | 3 0.03 0.54 1982 | 4 0.04 0.58 1983 | 9 0.09 0.67 1984 | 5 0.05 0.72 1985 | 14 0.14 0.86 1986 | 16 0.16 1.02 1987 | 26 0.26 1.28 1988 | 22 0.22 1.50 1989 | 27 0.27 1.77 1990 | 64 0.64 2.41 1991 | 84 0.84 3.25 1992 | 101 1.01 4.26 1993 | 77 0.77 5.03 1994 | 137 1.37 6.40 1995 | 182 1.82 8.22 1996 | 147 1.47 9.69 1997 | 273 2.73 12.42 1998 | 280 2.80 15.22 1999 | 358 3.58 18.80 2000 | 418 4.18 22.98 2001 | 407 4.07 27.05 2002 | 489 4.89 31.94 2003 | 534 5.34 37.28 2004 | 490 4.90 42.18 2005 | 556 5.56 47.74 2006 | 575 5.75 53.49 2007 | 579 5.79 59.28 2008 | 412 4.12 63.40 2009 | 280 2.80 66.20 2010 | 280 2.80 69.00 2011 | 265 2.65 71.65 2012 | 362 3.62 75.27 2013 | 395 3.95 79.22 2014 | 453 4.53 83.75 2015 | 386 3.86 87.61 2016 | 22 0.22 87.83 9998 | 1 0.01 87.84 9999 | 263 2.63 90.47 . | 953 9.53 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016