1896

4.8

1994

8.7

2013

7.2

1979

8.2

2007

6.5

1997

5.6

2005

7.0

1968

6.9

1998

7.8

1972

8.7

2006

6.1

1966

8.5

1994

8.3

1998

7.9

2009

7.6

2010

7.6

1990

6.1

1983

5.5

1995

7.9

1988

6.9