1991

6.3

1954

8.4

1985

8.3

2008

6.4

1977

8.2

1990

7.4

1992

7.7

2013

5.7

2002

6.9

2009

6.6

1988

7.1

2006

6.6

2013

7.5

2008

7.8

2013

6.9

2005

6.9

2009

7.2

1931

8.1

1995

6.5

2020

6.7