2004

7.2

2006

7.0

2002

7.1

2017

6.0

2004

6.6

1981

6.4

1994

3.2

2000

6.4

2001

5.8

2007

5.7

1970

3.8

1999

3.2

2002

6.2

2003

6.8

2000

6.2

1997

6.1

1989

6.3

1976

3.3

2001

6.7

1992

0.0