Parent Child Drilldown
1990
2010
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
0
150
25
50
75
100
125
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Click on a year above to view monthly stats for that year
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