1994

8.4

1985

7.5

1984

6.1

2012

5.6

2003

7.6

2019

7.7

2002

6.0

2002

7.3

1984

5.9

2019

7.7

1976

7.2

2019

4.5

2019

1.0

1999

7.5

1977

5.5

1955

0.0

2007

6.6

1998

7.2

2006

8.4

2004

7.9