1992

6.0

1992

5.4

2017

7.8

2006

5.1

2005

4.7

2001

6.5

2001

5.1

1996

5.9

2005

4.9

2003

6.8

2000

6.4

2006

7.6

1993

6.7

1974

6.1

2002

4.4

1989

5.7

1994

6.2

1963

7.0

2004

6.7

1975

6.2