1949

7.9

1984

7.2

1999

6.7

2016

0.5

1974

5.5

2001

6.4

2005

5.4

2002

5.5

2014

6.3

1998

5.8

1991

6.2

1972

7.4

2006

5.3

1995

6.8

1993

6.7

2002

7.5

2004

7.3

2007

7.4

1982

6.2

1994

5.9