1990

6.1

1976

5.5

1973

9.2

2009

6.2

2014

6.2

2010

7.7

2007

6.7

1997

6.8

1958

6.9

2003

5.3

1991

4.7

1999

9.1

1988

6.2

1992

6.8

2008

5.3

1994

7.4

2002

9.1

1997

5.4

2017

8.2

1989

5.5