Frequencies for first 10,000 rows of mod_year variable in vehicle dataset : MODEL YEAR | Freq. Percent Cum. ------------+----------------------------------- 1951 | 1 0.01 0.01 1953 | 1 0.01 0.02 1957 | 2 0.02 0.04 1960 | 3 0.03 0.07 1961 | 1 0.01 0.08 1964 | 6 0.06 0.14 1965 | 10 0.10 0.24 1966 | 3 0.03 0.27 1967 | 2 0.02 0.29 1968 | 9 0.09 0.38 1969 | 6 0.06 0.44 1970 | 13 0.13 0.57 1971 | 13 0.13 0.70 1972 | 13 0.13 0.83 1973 | 19 0.19 1.02 1974 | 17 0.17 1.19 1975 | 15 0.15 1.34 1976 | 16 0.16 1.50 1977 | 21 0.21 1.71 1978 | 33 0.33 2.04 1979 | 32 0.32 2.36 1980 | 29 0.29 2.65 1981 | 38 0.38 3.03 1982 | 53 0.53 3.56 1983 | 43 0.43 3.99 1984 | 87 0.87 4.86 1985 | 114 1.14 6.00 1986 | 144 1.44 7.44 1987 | 197 1.97 9.41 1988 | 221 2.21 11.62 1989 | 306 3.06 14.68 1990 | 309 3.09 17.77 1991 | 363 3.63 21.40 1992 | 345 3.45 24.85 1993 | 419 4.19 29.04 1994 | 482 4.82 33.86 1995 | 541 5.41 39.27 1996 | 475 4.75 44.02 1997 | 580 5.80 49.82 1998 | 558 5.58 55.40 1999 | 652 6.52 61.92 2000 | 753 7.53 69.45 2001 | 674 6.74 76.19 2002 | 645 6.45 82.64 2003 | 752 7.52 90.16 2004 | 621 6.21 96.37 2005 | 47 0.47 96.84 9999 | 316 3.16 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 18 Apr 2016