1997

7.6

1995

8.4

1991

7.6

1974

7.1

2000

5.1

1994

6.7

2008

6.0

1994

7.3

1941

7.1

2007

5.6

1988

6.1

2017

10.0

1997

6.5

2001

6.7

2002

6.2

2001

5.9

2003

5.7

2013

6.4

2015

7.7

2016

7.8