data a;
input year x;
cards;
2000 59571
2001 75270
2002 78114
2003 99349
2004 107316
2005 197531
2006 261249
2007 297499
2008 378065
2009 442574
2010 518967
2011 .
2012 1018813
;
run;
proc expand data=a out=b;
id year;
run;[img][/img]