1918

0.0

1964

7.0

2010

7.8

2009

7.2

1999

6.1

1999

6.4

2005

4.2

2002

7.8

1965

7.2

1990

6.6

1996

6.3

1998

4.4

2006

6.3

1992

6.8

2005

7.2

1931

7.3

2005

6.4

2004

6.2

1998

5.3

1996

6.5