1971

0.092

0.1

1972

1

1973

0.2

1974

0.5

1975

0.4

1976

1977

0.5

0.8

1978

1979

1

1.6

1980

1981

3.2

1982

1.8

1983

6.4

1984

4

1985

11.4

12.8

1986

4

1987

11

25.6

1988

1989

51.2

1990

44

1991

102.4

1992

300

1993

204.8

1994

88

1995

409.6

1996

541

1997

525

819.2

1998

1999

1354

1638.4

2000

3561

2001

3276.8

2002

5935

2003

9726

6553.6

2004

2005

18900

13107.2

2006

27100

2007

8800

26214.4

2008

2009

42427

52428.8