Year	Units
1982-01-01	25185.33333333330
1983-01-01	24738.00000000000
1984-01-01	23477.33333333330
1985-01-01	24169.00000000000
1986-01-01	23142.66666666670
1987-01-01	19066.66666666670
1988-01-01	16855.33333333330
1989-01-01	17162.33333333330
1990-01-01	14590.33333333330
1991-01-01	11054.66666666670
1992-01-01	8602.33333333333
1993-01-01	6971.00000000000
1994-01-01	6982.33333333333
1995-01-01	6180.25000000000
1996-01-01	7064.25000000000
1997-01-01	7032.50000000000
1998-01-01	5080.75000000000
1999-01-01	4821.75000000000
2000-01-01	5395.75000000000
2001-01-01	7013.50000000000
2002-01-01	7877.75000000000
2003-01-01	8885.75000000000
2004-01-01	10978.25000000000
2005-01-01	10271.00000000000
2006-01-01	8466.00000000000
2007-01-01	9039.75000000000
2008-01-01	9018.75000000000
2009-01-01	7998.50000000000
2010-01-01	5205.75000000000
2011-01-01	3163.75000000000
2012-01-01	2640.00000000000
2013-01-01	1823.25000000000