1951

7.7

2006

5.7

1971

7.0

2004

7.2

1994

8.3

1947

7.6

1995

6.5

1990

7.0

2018

4.3

2007

6.7

1997

5.0

2015

5.8

2006

6.6

1998

6.3

2003

5.9

1985

7.3

1991

6.3

2008

6.8

2009

6.7

2002

5.4