2007

7.5

1987

6.9

1998

7.2

2000

6.5

2006

6.6

2004

2.0

2002

6.2

1997

6.8

2015

7.1

2013

1.0

2005

6.8

1997

6.6

1978

6.6

2001

6.4

2007

6.3

2007

6.6

1958

0.0

0.0

1964

5.8

1985

6.0