Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : vehicle | model year | Freq. Percent Cum. ------------+----------------------------------- 1934 | 2 0.02 0.02 1942 | 1 0.01 0.03 1946 | 1 0.01 0.04 1954 | 1 0.01 0.05 1955 | 1 0.01 0.06 1956 | 1 0.01 0.07 1957 | 2 0.02 0.09 1959 | 1 0.01 0.10 1961 | 1 0.01 0.11 1962 | 1 0.01 0.12 1963 | 1 0.01 0.13 1965 | 2 0.02 0.15 1966 | 3 0.03 0.18 1967 | 3 0.03 0.21 1968 | 1 0.01 0.22 1969 | 1 0.01 0.23 1971 | 4 0.04 0.27 1972 | 6 0.06 0.33 1973 | 5 0.05 0.38 1974 | 2 0.02 0.40 1975 | 2 0.02 0.42 1976 | 6 0.06 0.48 1977 | 8 0.08 0.56 1978 | 13 0.13 0.69 1979 | 10 0.10 0.79 1980 | 5 0.05 0.84 1981 | 6 0.06 0.90 1982 | 10 0.10 1.00 1983 | 14 0.14 1.14 1984 | 21 0.21 1.35 1985 | 25 0.25 1.60 1986 | 39 0.39 1.99 1987 | 30 0.30 2.29 1988 | 58 0.58 2.87 1989 | 78 0.78 3.65 1990 | 69 0.69 4.34 1991 | 93 0.93 5.27 1992 | 105 1.05 6.32 1993 | 139 1.39 7.71 1994 | 188 1.88 9.59 1995 | 234 2.34 11.93 1996 | 262 2.62 14.55 1997 | 331 3.31 17.86 1998 | 362 3.62 21.48 1999 | 414 4.14 25.62 2000 | 556 5.56 31.18 2001 | 546 5.46 36.64 2002 | 530 5.30 41.94 2003 | 646 6.46 48.40 2004 | 589 5.89 54.29 2005 | 617 6.17 60.46 2006 | 676 6.76 67.22 2007 | 639 6.39 73.61 2008 | 484 4.84 78.45 2009 | 329 3.29 81.74 2010 | 326 3.26 85.00 2011 | 353 3.53 88.53 2012 | 465 4.65 93.18 2013 | 367 3.67 96.85 2014 | 32 0.32 97.17 9998 | 1 0.01 97.18 9999 | 282 2.82 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016