2003

8.2

2006

7.9

1997

7.0

2007

6.4

1987

4.1

2005

7.1

1982

7.4

1994

6.2

2005

6.3

1990

7.4

2003

7.2

1999

7.4

1991

6.8

1995

7.3

1991

7.3

1981

7.2

2003

6.3

1992

4.5

2016

7.8

2002

6.3