1997

8.4

2015

6.0

2006

7.7

2007

7.2

2004

7.1

1994

8.5

1991

7.4

2002

6.8

1926

2.0

2020

6.7

1997

6.5

1989

5.0

2003

7.5

1991

8.0

2017

6.0

1977

8.0

1977

3.9

1991

4.2

2006

4.3

2015

6.0