Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : vehicle | model year | Freq. Percent Cum. ------------+----------------------------------- 1932 | 2 0.02 0.02 1951 | 1 0.01 0.03 1953 | 1 0.01 0.04 1957 | 2 0.02 0.06 1964 | 1 0.01 0.07 1965 | 2 0.02 0.09 1966 | 3 0.03 0.12 1967 | 3 0.03 0.15 1969 | 3 0.03 0.18 1970 | 2 0.02 0.20 1971 | 2 0.02 0.22 1972 | 2 0.02 0.24 1973 | 5 0.05 0.29 1974 | 4 0.04 0.33 1975 | 1 0.01 0.34 1976 | 7 0.07 0.41 1977 | 5 0.05 0.46 1978 | 8 0.08 0.54 1979 | 4 0.04 0.58 1980 | 15 0.15 0.73 1981 | 11 0.11 0.84 1982 | 16 0.16 1.00 1983 | 12 0.12 1.12 1984 | 17 0.17 1.29 1985 | 21 0.21 1.50 1986 | 23 0.23 1.73 1987 | 34 0.34 2.07 1988 | 52 0.52 2.59 1989 | 58 0.58 3.17 1990 | 57 0.57 3.74 1991 | 84 0.84 4.58 1992 | 95 0.95 5.53 1993 | 128 1.28 6.81 1994 | 140 1.40 8.21 1995 | 210 2.10 10.31 1996 | 210 2.10 12.41 1997 | 314 3.14 15.55 1998 | 322 3.22 18.77 1999 | 395 3.95 22.72 2000 | 530 5.30 28.02 2001 | 507 5.07 33.09 2002 | 563 5.63 38.72 2003 | 599 5.99 44.71 2004 | 593 5.93 50.64 2005 | 629 6.29 56.93 2006 | 609 6.09 63.02 2007 | 628 6.28 69.30 2008 | 453 4.53 73.83 2009 | 298 2.98 76.81 2010 | 303 3.03 79.84 2011 | 327 3.27 83.11 2012 | 455 4.55 87.66 2013 | 512 5.12 92.78 2014 | 381 3.81 96.59 2015 | 30 0.30 96.89 9998 | 1 0.01 96.90 9999 | 310 3.10 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016