Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : Vehicle | Model Year | Freq. Percent Cum. ------------+----------------------------------- 1930 | 1 0.01 0.01 1931 | 2 0.02 0.03 1950 | 1 0.01 0.04 1951 | 1 0.01 0.05 1954 | 1 0.01 0.06 1955 | 1 0.01 0.07 1957 | 1 0.01 0.08 1960 | 1 0.01 0.09 1963 | 2 0.02 0.11 1964 | 1 0.01 0.12 1965 | 7 0.07 0.19 1967 | 1 0.01 0.20 1968 | 1 0.01 0.21 1969 | 8 0.08 0.29 1970 | 10 0.10 0.39 1971 | 5 0.05 0.44 1972 | 7 0.07 0.51 1973 | 5 0.05 0.56 1974 | 8 0.08 0.64 1975 | 6 0.06 0.70 1976 | 2 0.02 0.72 1977 | 8 0.08 0.80 1978 | 7 0.07 0.87 1979 | 14 0.14 1.01 1980 | 7 0.07 1.08 1981 | 8 0.08 1.16 1982 | 13 0.13 1.29 1983 | 17 0.17 1.46 1984 | 24 0.24 1.70 1985 | 31 0.31 2.01 1986 | 40 0.40 2.41 1987 | 48 0.48 2.89 1988 | 55 0.55 3.44 1989 | 74 0.74 4.18 1990 | 121 1.21 5.39 1991 | 136 1.36 6.75 1992 | 140 1.40 8.15 1993 | 170 1.70 9.85 1994 | 233 2.33 12.18 1995 | 332 3.32 15.50 1996 | 287 2.87 18.37 1997 | 376 3.76 22.13 1998 | 444 4.44 26.57 1999 | 517 5.17 31.74 2000 | 574 5.74 37.48 2001 | 623 6.23 43.71 2002 | 589 5.89 49.60 2003 | 647 6.47 56.07 2004 | 648 6.48 62.55 2005 | 663 6.63 69.18 2006 | 678 6.78 75.96 2007 | 661 6.61 82.57 2008 | 511 5.11 87.68 2009 | 360 3.60 91.28 2010 | 274 2.74 94.02 2011 | 275 2.75 96.77 2012 | 29 0.29 97.06 9998 | 1 0.01 97.07 9999 | 293 2.93 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016