Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : vehicle | model year | Freq. Percent Cum. ------------+----------------------------------- 1926 | 1 0.01 0.01 1930 | 1 0.01 0.02 1941 | 1 0.01 0.03 1953 | 1 0.01 0.04 1956 | 1 0.01 0.05 1957 | 1 0.01 0.06 1961 | 1 0.01 0.07 1962 | 2 0.02 0.09 1964 | 5 0.05 0.14 1965 | 3 0.03 0.17 1966 | 3 0.03 0.20 1967 | 4 0.04 0.24 1968 | 1 0.01 0.25 1969 | 5 0.05 0.30 1970 | 5 0.05 0.35 1971 | 5 0.05 0.40 1972 | 2 0.02 0.42 1973 | 6 0.06 0.48 1974 | 5 0.05 0.53 1975 | 3 0.03 0.56 1976 | 3 0.03 0.59 1977 | 6 0.06 0.65 1978 | 11 0.11 0.76 1979 | 4 0.04 0.80 1980 | 3 0.03 0.83 1981 | 12 0.12 0.95 1982 | 14 0.14 1.09 1983 | 15 0.15 1.24 1984 | 19 0.19 1.43 1985 | 28 0.28 1.71 1986 | 32 0.32 2.03 1987 | 59 0.59 2.62 1988 | 52 0.52 3.14 1989 | 78 0.78 3.92 1990 | 101 1.01 4.93 1991 | 142 1.42 6.35 1992 | 133 1.33 7.68 1993 | 190 1.90 9.58 1994 | 219 2.19 11.77 1995 | 267 2.67 14.44 1996 | 255 2.55 16.99 1997 | 344 3.44 20.43 1998 | 394 3.94 24.37 1999 | 436 4.36 28.73 2000 | 570 5.70 34.43 2001 | 617 6.17 40.60 2002 | 608 6.08 46.68 2003 | 631 6.31 52.99 2004 | 682 6.82 59.81 2005 | 699 6.99 66.80 2006 | 565 5.65 72.45 2007 | 632 6.32 78.77 2008 | 457 4.57 83.34 2009 | 318 3.18 86.52 2010 | 295 2.95 89.47 2011 | 376 3.76 93.23 2012 | 362 3.62 96.85 2013 | 31 0.31 97.16 9999 | 284 2.84 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016