I've got panel data from 2009-2016.
Some individuals don't have data for the entire period.

ID year
1 2009
1 2010
1 2011
2 2009
2 2010
2 2011
2 2012
2 2013
2 2014
2 2015
2 2016

I want to remove all individuals which don't have observation for every year, like 1 does in this case. How can I do it?