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 1963 | 1 0.01 0.12 1965 | 2 0.02 0.14 1966 | 3 0.03 0.17 1967 | 3 0.03 0.20 1968 | 1 0.01 0.21 1969 | 1 0.01 0.22 1971 | 4 0.04 0.26 1972 | 6 0.06 0.32 1973 | 5 0.05 0.37 1974 | 2 0.02 0.39 1975 | 2 0.02 0.41 1976 | 6 0.06 0.47 1977 | 8 0.08 0.55 1978 | 14 0.14 0.69 1979 | 10 0.10 0.79 1980 | 5 0.05 0.84 1981 | 7 0.07 0.91 1982 | 10 0.10 1.01 1983 | 14 0.14 1.15 1984 | 19 0.19 1.34 1985 | 25 0.25 1.59 1986 | 40 0.40 1.99 1987 | 30 0.30 2.29 1988 | 58 0.58 2.87 1989 | 79 0.79 3.66 1990 | 70 0.70 4.36 1991 | 93 0.93 5.29 1992 | 103 1.03 6.32 1993 | 138 1.38 7.70 1994 | 188 1.88 9.58 1995 | 232 2.32 11.90 1996 | 264 2.64 14.54 1997 | 335 3.35 17.89 1998 | 364 3.64 21.53 1999 | 413 4.13 25.66 2000 | 559 5.59 31.25 2001 | 544 5.44 36.69 2002 | 520 5.20 41.89 2003 | 647 6.47 48.36 2004 | 593 5.93 54.29 2005 | 629 6.29 60.58 2006 | 667 6.67 67.25 2007 | 643 6.43 73.68 2008 | 476 4.76 78.44 2009 | 329 3.29 81.73 2010 | 325 3.25 84.98 2011 | 350 3.50 88.48 2012 | 461 4.61 93.09 2013 | 368 3.68 96.77 2014 | 33 0.33 97.10 9998 | 1 0.01 97.11 9999 | 289 2.89 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016