I have the following list of observations of calendar time:

 [1] 03-Nov-1997 09-Oct-1991 27-Aug-1992 01-Jul-1994 19-Jan-1990 12-Nov-1993
 [7] 08-Oct-1993 10-Nov-1982 08-Dec-1986 23-Dec-1987 02-Aug-1995 20-Oct-1998
[13] 29-Apr-1991 16-Mar-1994 20-May-1991 28-Dec-1987 14-Jul-1999 27-Nov-1998
[19] 09-Sep-1999 26-Aug-1999 20-Jun-1997 05-May-1995 26-Mar-1998 15-Aug-1994
[25] 24-Jun-1996 02-Oct-1996 12-Aug-1985 24-Jun-1992 09-Jan-1991 04-Mar-1988
3230 Levels: 01-Apr-1987 01-Apr-1990 01-Apr-1991 01-Apr-1996 ... 31-Oct-1998

I want to make a plot where x-axis is the calendar time and y-axix is the
cumulative sum of observations observed on or before that dates.

Can anyone give some suggestions?

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