2013

6.8

1960

8.4

1996

6.6

2002

7.1

2005

7.8

2005

6.4

2001

7.4

2001

6.7

1994

5.8

1993

5.0

2000

5.7

1984

3.3

1990

5.7

1992

5.7

1974

5.9

1973

5.4

1985

6.7

1965

6.0

1968

5.5

1930

6.8