1994

6.2

2000

5.4

2007

6.5

1963

7.2

2002

6.0

1986

6.8

1994

6.2

1976

7.3

2002

6.0

2017

5.8

2001

8.5

2006

5.1

1996

5.8

1982

5.5

2015

6.0

2007

6.2

2008

5.2

2002

7.4

1985

6.5

2007

6.8