2005

6.7

1991

7.6

1983

7.1

2015

5.9

1989

7.2

2005

7.7

1991

8.1

2003

6.2

2004

4.6

1999

4.5

1992

6.9

2003

6.9

2005

6.6

1983

6.0

2007

5.6

1976

6.2

2000

5.5

1996

6.2

2003

5.3

1995

5.8