Frequencies for pmodyear variable in parkwork dataset : vehicle | model year | Freq. Percent Cum. ------------+----------------------------------- 1960 | 1 0.09 0.09 1963 | 1 0.09 0.18 1968 | 1 0.09 0.28 1969 | 1 0.09 0.37 1973 | 1 0.09 0.46 1974 | 1 0.09 0.55 1976 | 1 0.09 0.64 1980 | 3 0.28 0.92 1982 | 1 0.09 1.01 1983 | 1 0.09 1.10 1984 | 3 0.28 1.38 1985 | 2 0.18 1.56 1986 | 6 0.55 2.11 1987 | 8 0.73 2.85 1988 | 9 0.83 3.67 1989 | 10 0.92 4.59 1990 | 10 0.92 5.51 1991 | 9 0.83 6.34 1992 | 12 1.10 7.44 1993 | 14 1.29 8.72 1994 | 9 0.83 9.55 1995 | 26 2.39 11.94 1996 | 14 1.29 13.22 1997 | 26 2.39 15.61 1998 | 35 3.21 18.82 1999 | 52 4.78 23.60 2000 | 60 5.51 29.11 2001 | 73 6.70 35.81 2002 | 56 5.14 40.96 2003 | 46 4.22 45.18 2004 | 66 6.06 51.24 2005 | 57 5.23 56.47 2006 | 71 6.52 62.99 2007 | 65 5.97 68.96 2008 | 39 3.58 72.54 2009 | 35 3.21 75.76 2010 | 34 3.12 78.88 2011 | 53 4.87 83.75 2012 | 59 5.42 89.16 2013 | 55 5.05 94.21 2014 | 47 4.32 98.53 2015 | 5 0.46 98.99 9999 | 11 1.01 100.00 ------------+----------------------------------- Total | 1,089 100.00 by Jean Roth , jroth@nber.org , 22 Oct 2016