2002

6.3

1999

4.4

2005

5.6

1987

7.3

1997

4.0

1985

7.5

1994

5.9

2007

7.4

1984

7.2

2005

5.9

1990

6.0

2004

6.4

2004

7.7

1980

5.6

2003

3.1

1997

6.5

1997

5.2

1958

7.2

1994

5.7

2001

6.5