1950

8.1

2003

7.8

1972

7.1

2001

7.4

1998

6.4

1996

8.0

2014

5.0

1997

6.6

2005

6.9

1959

7.8

2004

7.4

2015

7.4

2006

4.2

1977

6.0

1978

7.2

1982

6.3

1995

6.7

1992

6.8

1997

4.1

1982

4.8