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PERIOD VALUE
1997 10653
1998 9912
1999 9550
2000 10101
2001 10987
2002 11367
2003 11577
2004 12816
2005 13338
2006 12952
2007 14592
2008 13462
2009 14282
2010 14789
2011 15550
2012 17112
2013 17902
2014 19600
2015 20498
2016 24935
2017 27852
2018 28171