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 | 15 0.15 0.94 1985 | 13 0.13 1.07 1986 | 22 0.22 1.29 1987 | 25 0.25 1.54 1988 | 45 0.45 1.99 1989 | 49 0.49 2.48 1990 | 63 0.63 3.11 1991 | 84 0.84 3.95 1992 | 78 0.78 4.73 1993 | 112 1.12 5.85 1994 | 148 1.48 7.33 1995 | 206 2.06 9.39 1996 | 242 2.42 11.81 1997 | 337 3.37 15.18 1998 | 316 3.16 18.34 1999 | 345 3.45 21.79 2000 | 472 4.72 26.51 2001 | 472 4.72 31.23 2002 | 477 4.77 36.00 2003 | 569 5.69 41.69 2004 | 537 5.37 47.06 2005 | 595 5.95 53.01 2006 | 529 5.29 58.30 2007 | 544 5.44 63.74 2008 | 334 3.34 67.08 2009 | 244 2.44 69.52 2010 | 227 2.27 71.79 2011 | 292 2.92 74.71 2012 | 372 3.72 78.43 2013 | 455 4.55 82.98 2014 | 428 4.28 87.26 2015 | 20 0.20 87.46 9998 | 1 0.01 87.47 9999 | 239 2.39 89.86 . | 1,014 10.14 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016