2013

8.7

2005

8.1

2011

2.8

2000

6.5

1994

7.0

2018

0.0

2011

6.3

2000

7.8

2018

9.0

2005

6.3

1984

7.5

1991

6.4

1967

7.4

2002

8.6

1977

6.8

1999

7.9

1999

8.2

1994

8.1

1986

7.9

1997

6.3