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 1941 | 1 0.01 0.03 1947 | 1 0.01 0.04 1950 | 1 0.01 0.05 1953 | 1 0.01 0.06 1954 | 1 0.01 0.07 1955 | 1 0.01 0.08 1956 | 1 0.01 0.09 1963 | 1 0.01 0.10 1965 | 3 0.03 0.13 1966 | 3 0.03 0.16 1967 | 3 0.03 0.19 1968 | 4 0.04 0.23 1969 | 6 0.06 0.29 1970 | 5 0.05 0.34 1971 | 6 0.06 0.40 1972 | 3 0.03 0.43 1973 | 8 0.08 0.51 1974 | 7 0.07 0.58 1975 | 5 0.05 0.63 1976 | 6 0.06 0.69 1977 | 7 0.07 0.76 1978 | 10 0.10 0.86 1979 | 14 0.14 1.00 1980 | 12 0.12 1.12 1981 | 13 0.13 1.25 1982 | 17 0.17 1.42 1983 | 14 0.14 1.56 1984 | 24 0.24 1.80 1985 | 35 0.35 2.15 1986 | 38 0.38 2.53 1987 | 45 0.45 2.98 1988 | 59 0.59 3.57 1989 | 79 0.79 4.36 1990 | 119 1.19 5.55 1991 | 122 1.22 6.77 1992 | 168 1.68 8.45 1993 | 188 1.88 10.33 1994 | 271 2.71 13.04 1995 | 306 3.06 16.10 1996 | 339 3.39 19.49 1997 | 415 4.15 23.64 1998 | 452 4.52 28.16 1999 | 520 5.20 33.36 2000 | 684 6.84 40.20 2001 | 557 5.57 45.77 2002 | 596 5.96 51.73 2003 | 662 6.62 58.35 2004 | 674 6.74 65.09 2005 | 681 6.81 71.90 2006 | 687 6.87 78.77 2007 | 702 7.02 85.79 2008 | 496 4.96 90.75 2009 | 355 3.55 94.30 2010 | 247 2.47 96.77 2011 | 29 0.29 97.06 9999 | 294 2.94 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016