R help - Jan 2014 - Converting list with different vector lengths into a dataframe (or export it as .csv)

Dear all,

I have this list

years <- list(c("2004", "2007"), c("2010",
"2005"), c("2009", "2001"),
    c("2006", "2000", "2004", "2009"),
c("2006", "2000"), c("2006", "2000"),
    c("2005", "2007"), c("2005",
"2007"), c("2001", "2006"),
    c("2005", "2001", "2008"), c("2005",
"2001", "2008"), c("2005",
    "2000"), c("2005", "2000"),
c("2006", "2005", "2003"), c("2006",
    "2005", "2003"), c("2007", "2004",
"2007"), c("2004", "2007"
    ), c("2004", "2007"), c("2004",
"2007"), c("2010", "2007"
    ), c("2008", "2005"), c("2008",
"2005"), c("2008", "2005"
    ), c("2004", "2007"), c("2004",
"2007"), c("2011", "2006"
    ), c("2009", "2005", "2003"),
c("2009", "2005", "2003"),
    c("2009", "2001"), c("2007", "2003",
"2004"), c("2007", "2004"
    ), c("2007", "2004"), c("2008",
"2010", "2001"), c("2010",
    "2005"), c("2007", "2005"),
c("2007", "2005"), c("2007",
    "2005"), c("2010", "2005"),
c("2010", "2005"), c("2010",
    "2005"), c("2007", "2005"),
c("2007", "2005"), c("2008",
    "2007"), c("2003", "2005"),
c("2003", "2005"), c("2005",
    "2003"), c("2005", "2003"),
c("2005", "2003"))

Each vector represents an location, and the years that this location has
burned. Therefore, I'd like to get a dataframe with each vector on a row,
and the years in columns, but I can't because vectors have different
lengths. 
I have also tried to export it to a csv (and then open it with excel), but I
get the same error. 

Thank a lot in advance for your valuable help.





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