1997

8.1

2006

8.2

1997

7.3

1994

8.4

1989

8.0

2000

7.9

1984

7.0

2003

7.8

1974

7.9

2001

7.6

2011

7.5

1959

8.4

1971

8.1

2018

7.2

1996

7.7

2015

8.0

2000

8.0

1996

8.0

2004

7.8

2018

8.0