2,337
-6,000
-4,000
-2,000
2,000
4,000
6,000
1,058
1990
-2,012
1991
-2,863
1992
-7,818
1993
-5,102
1994
-3,263
1995
-3,743
1996
-5,269
1997
-858
1998
-2,352
1999
3,970
2000
-225
2001
-2,629
2002
-2,801
2003
-1,656
2004
-121
2005
2,534
2006
4,127
2007
7,297
2008
2,721
2009
3,568
2010
1,912
2011
1,262
2012
1,332
2013
-124
2014
2,337
2015
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