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 1957 | 1 0.01 0.03 1965 | 3 0.03 0.06 1966 | 2 0.02 0.08 1967 | 2 0.02 0.10 1969 | 4 0.04 0.14 1970 | 1 0.01 0.15 1972 | 1 0.01 0.16 1973 | 5 0.05 0.21 1974 | 2 0.02 0.23 1975 | 1 0.01 0.24 1976 | 6 0.06 0.30 1977 | 4 0.04 0.34 1978 | 9 0.09 0.43 1979 | 4 0.04 0.47 1980 | 11 0.11 0.58 1981 | 6 0.06 0.64 1982 | 8 0.08 0.72 1983 | 7 0.07 0.79 1984 | 14 0.14 0.93 1985 | 13 0.13 1.06 1986 | 22 0.22 1.28 1987 | 25 0.25 1.53 1988 | 45 0.45 1.98 1989 | 49 0.49 2.47 1990 | 63 0.63 3.10 1991 | 84 0.84 3.94 1992 | 75 0.75 4.69 1993 | 112 1.12 5.81 1994 | 148 1.48 7.29 1995 | 206 2.06 9.35 1996 | 240 2.40 11.75 1997 | 336 3.36 15.11 1998 | 320 3.20 18.31 1999 | 341 3.41 21.72 2000 | 475 4.75 26.47 2001 | 472 4.72 31.19 2002 | 475 4.75 35.94 2003 | 566 5.66 41.60 2004 | 539 5.39 46.99 2005 | 596 5.96 52.95 2006 | 531 5.31 58.26 2007 | 544 5.44 63.70 2008 | 334 3.34 67.04 2009 | 245 2.45 69.49 2010 | 229 2.29 71.78 2011 | 292 2.92 74.70 2012 | 372 3.72 78.42 2013 | 455 4.55 82.97 2014 | 426 4.26 87.23 2015 | 19 0.19 87.42 9998 | 1 0.01 87.43 9999 | 243 2.43 89.86 . | 1,014 10.14 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016