1980

-3,375.8

1981

-3,126.7

1982

-2,731.6

1983

-1,232.9

1984

-754.8

1985

128.2

1986

815.2

1987

-229.4

1988

3,898.8

1989

5,779.9

1990

5,659.2

1991

8,430.9

1992

9,634.9

1993

6,804.2

1994

17,412.5

1995

20,398.2

1996

19,536.7

1997

22,085.4

1998

30,622.9

1999

24,332.0

2000

18,475.0

2001

19,224.3

2002

19,919.1

2003

37,612.6

2004

30,821.1

2005

37,075.5

2006

47,295.0

2007

59,013.9