1987

7.3

1989

7.0

1992

6.7

1998

6.6

1990

6.1

2009

3.7

2003

3.1

2000

6.5

1988

5.6

1953

2.8

1993

4.2

1961

0.0

1999

4.5

2004

6.8

1997

7.7

1987

6.5

2007

6.5

2005

5.4

2003

5.8

1993

0.0