1993

5.8

2013

6.1

1968

6.9

1993

7.1

2012

5.0

1990

6.5

1982

5.7

2001

7.4

2007

10.0

1994

6.8

1999

7.3

1991

7.2

1997

7.6

2006

7.1

1960

6.3

1995

5.2

2015

8.1

1998

6.0

1956

7.1

2000

6.0