2006

6.1

1994

6.2

2008

6.4

2002

7.1

2011

6.4

1998

6.6

1990

7.5

1991

8.1

2000

6.4

1967

5.6

2003

5.7

2010

6.2

2001

6.2

1997

6.5

1990

7.3

2019

6.7

1997

6.7

1980

7.7

1951

7.2

1992

4.8