1956

1.7

1888

6.4

2003

6.6

2006

6.6

1999

6.5

1995

7.1

1992

5.2

2004

5.6

1990

5.9

2004

6.5

1991

6.2

2002

7.6

2008

5.5

1997

6.5

2002

7.0

1999

6.3

1998

6.9

1997

6.8

1996

7.1

2003

6.2