1995

6.5

1998

6.7

2005

6.6

2004

6.3

2001

6.2

1984

7.2

2000

6.0

1990

7.0

2003

7.2

1993

6.2

2006

6.6

1954

8.0

1989

7.1

1990

7.2

1990

6.8

1990

6.8

1994

6.2

2005

6.3

2006

7.5

2014

6.4