2004

7.1

2003

7.5

1991

7.4

2007

6.9

2002

6.8

1997

8.4

2006

7.7

1994

8.5

1926

2.0

1989

5.0

1997

6.5

2020

6.7

1991

8.0

2007

7.2

2015

6.0

2017

6.0

1991

4.2

1977

8.0

1977

3.9

2011

7.2