as.Date function error

Hi,

I have some problems with as.Date function.
After I applied as.Date for my data, "2010" changed to "2020" as below
Where am I wrong?

Thanks

Wonjae

x=c("11/16/2010","11/17/2010","11/18/2010","11/19/2010")
x=as.Date(x,"%m/%d/%y")
x

[1] "2020-11-16" "2020-11-17" "2020-11-18" "2020-11-19"

my R veision is 2.12.2.

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