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PERIOD VALUE
1997 20924
1998 20893
1999 21911
2000 22153
2001 24972
2002 25622
2003 27262
2004 28892
2005 28901
2006 29012
2007 32478
2008 30494
2009 32867
2010 33036
2011 35518
2012 37237
2013 40097
2014 47135
2015 47129
2016 53889
2017 58121
2018 61528