Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1927 | 1 0.01 0.01 1929 | 1 0.01 0.02 1932 | 1 0.01 0.03 1951 | 1 0.01 0.04 1952 | 1 0.01 0.05 1955 | 1 0.01 0.06 1956 | 1 0.01 0.07 1957 | 1 0.01 0.08 1958 | 1 0.01 0.09 1960 | 1 0.01 0.10 1961 | 1 0.01 0.11 1963 | 1 0.01 0.12 1964 | 4 0.04 0.16 1966 | 4 0.04 0.20 1967 | 4 0.04 0.24 1968 | 6 0.06 0.30 1969 | 4 0.04 0.34 1970 | 8 0.08 0.42 1971 | 7 0.07 0.49 1972 | 8 0.08 0.57 1973 | 11 0.11 0.68 1974 | 6 0.06 0.74 1975 | 9 0.09 0.83 1976 | 4 0.04 0.87 1977 | 17 0.17 1.04 1978 | 12 0.12 1.16 1979 | 16 0.16 1.32 1980 | 11 0.11 1.43 1981 | 18 0.18 1.61 1982 | 25 0.25 1.86 1983 | 26 0.26 2.12 1984 | 48 0.48 2.60 1985 | 56 0.56 3.16 1986 | 65 0.65 3.81 1987 | 103 1.03 4.84 1988 | 123 1.23 6.07 1989 | 169 1.69 7.76 1990 | 212 2.12 9.88 1991 | 253 2.53 12.41 1992 | 232 2.32 14.73 1993 | 285 2.85 17.58 1994 | 342 3.42 21.00 1995 | 427 4.27 25.27 1996 | 377 3.77 29.04 1997 | 499 4.99 34.03 1998 | 481 4.81 38.84 1999 | 597 5.97 44.81 2000 | 700 7.00 51.81 2001 | 621 6.21 58.02 2002 | 647 6.47 64.49 2003 | 651 6.51 71.00 2004 | 594 5.94 76.94 2005 | 736 7.36 84.30 2006 | 707 7.07 91.37 2007 | 575 5.75 97.12 2008 | 43 0.43 97.55 9999 | 245 2.45 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016